Fermented Korean Kimchi Recipe and FAQ (Raw Oyster)

This article covers a fermented Korean kimchi recipe, the process of fermenting cabbage kimchi at home, and common homemade kimchi FAQs.

Skip to the fermented Korean kimchi recipe here

Making a fermented Korean kimchi recipe always seemed like a pickling rite of passage to me. As someone new to fermenting pickles (and frankly, eating “real” fermented pickles at all), making kimchi was intimidating.

However, I was determined to make kimchi at home. I tried to alleviate my nervousness by devoting a ton of time to researching how to do it properly. However, I ended up with a lot of questions, even as I learned more about the process.

Some of my kimchi-related questions included:

  • There are so many different cabbage kimchi recipes online! How do I know which recipe will taste authentic and delicious, and more importantly, not make me sick?
  • Korean kimchi has so many ingredients! Do you really need to have every ingredient exactly as the recipe calls for it? When (and what) can I substitute?
  • The amount of salt is measured in volume (not weight) in all these online recipes! That goes against every fermentation rule and recipe I’ve ever trusted. Is it safe to make kimchi at home without knowing exactly how much salt to use?
  • Do you really have to pack the pepper paste into each leaf of the cabbage individually? Does the packing process affect the flavor of kimchi at all, or is it just tradition?
  • Can you really ferment raw oysters at room temperature for several days without getting botulism? Isn’t that… crazy?

I had so many questions that I got tired of thinking about it and just got started. In the past few weeks, I’ve massaged many pounds of cabbage, fermented several batches of kimchi, and spent way too much time reading about the subject. After all that, I finally feel like I can confidently write a blog post about this subject.

This Maangchi-based kimchi recipe is excellent (in my opinion). I’ve eaten this homemade kimchi many times myself since I started fermenting it and I’ve fed it to many people that I love. It tastes complicated and interesting, and is layered with so many bold and subtle flavors – sour, salty, pungent, spicy, and so much more. 

I hope to explain what I’ve learned about making cabbage kimchi in this blog post, including my localized (British Columbia) version of an authentic Korean kimchi recipe, the process of fermenting kimchi, and common FAQs.

I hope this information will help you to make homemade kimchi with confidence!

This comprehensive kimchi fermentation article includes:

How To Make Fermented Korean Kimchi (Kimchi Fermentation Process)

There are several steps required to make Korean kimchi using natural fermentation methods:

  1. Brine cabbage with salt
  2. Prepare rice slurry
  3. Make pepper paste
  4. Pack kimchi
  5. Ferment kimchi
  6. Safely storing fermented kimchi

Step 1: Brine cabbage with salt

making traditional kimchi packing cabbage with salt

  1. Slice all the medium-sized napa cabbages in half (vertically). Start by slicing the base of the cabbage in a 2″ cut upwards, and then gently pull each half of the cabbage apart to separate. If the napa cabbages are very large, you can cut them into quarters to help the salt penetrate the cabbages in a reasonable amount of time.
  2. Gently wash cabbage in water and shake dry.
  3. Sprinkle salt between each cabbage leaf, lifting leaves and concentrating the salt in the cabbage bases and stems where they are thicker. Use the exact amount of salt called for the amount of cabbage you have – no more and no less. This ratio of salt to vegetable is important to maintain throughout the fermentation process to create an environment that will promote the growth of kimchi-friendly bacterias.
  4. Let cabbages rest for 2 hours in large container. The cabbages will release liquid, which will combine with the salt to create a brine. Massage, turn, and re-stack the cabbage every 30 minutes to ensure that the cabbages are equally and thoroughly brined. During this rest time, you can do the next few steps of the kimchi making process.
  5. After 2 hours, the cabbage should be soft and a little translucent. Separate each cabbage half into quarters and rinse under cold water, straining to drain.
  6. There should be a significant amount of liquid brine at the bottom of the container. Reserve the leftover brine for “Step 4: Pack kimchi”.

massaging salted cabbage for homemade kimchi ferment

Step 2: Prepare rice slurry

making slurry for homemade korean kimchi fermentation

  1. Pour water and rice flour in a saucepan and mix to incorporate. Turn the stove element on medium heat for 10 minutes and allow the slurry to cook, stirring occasionally.
  2. After 10 minutes, the rice slurry will start to bubble. Add sugar and cook for another minute, stirring constantly until sugar is dissolved.
  3. Remove from heat and allow to cool to room temperature. You can transfer the slurry to another container to decrease cooling time.

Step 3: Make kimchi pepper paste

raw oyster korean kimchi recipe pepper paste

  1. Put garlic, ginger, onion, fish sauce, and salted shrimp into a food processor. Process ingredients until the ginger and garlic are fully broken down. Add gochugaru (hot pepper flakes) and cooled rice slurry and process until it is an evenly mixed red paste.
    1. If your food processor isn’t big enough, you can mix the processed garlic-ginger-onion paste with the hot pepper flakes and rice slurry in a separate container.
    2. If you don’t have a food processor, you can mince the ingredients and combine by hand.
  2. Combine pepper paste with sliced radish, carrots (optional – I’m allergic to carrots, but carrots are traditionally added to Korean cabbage kimchi), green onion, Asian chives, and raw oysters. Put plastic gloves on and mix ingredients with your hands until combined.

Step 4: Pack kimchi

packing cabbage with kimchi paste for fermenting 2 packing cabbage with kimchi paste for fermenting 3

  1. Using gloves, lift and separate each cabbage leaf to spread kimchi paste throughout the brined cabbage quarters. Try to include the raw vegetable and oyster components between cabbage leaves.
  2. When every leaf is covered in a thin layer of paste, wrap the cabbage quarter into a bundle and pack it tightly into the fermentation crock or other fermentation container.
  3. Repeat with all cabbage quarters, packing each cabbage bundle tightly into the fermenting container side by side. Press packed bundles down regularly to ensure there are no air pockets or empty spaces in the container. Pack raw vegetable and oyster ingredients between cabbage bundles to incorporate evenly in the fermentation container.
  4. When all the cabbage is packed into the container, there should be some kimchi paste remaining. Spread the remaining kimchi paste on top, pushing any cabbage, other raw vegetable, and oyster ingredients under this layer of pepper paste. This will reduce the amount of exposure they have to oxygen and help create an environment that will be helpful for fermentation.
  5. The packed kimchi should be close to the top of the fermentation container. If you do not have enough kimchi to fill your container, you have two choices:
    1. Option 1 – You can add a plastic food-safe bag filled with the leftover brine to the kimchi container to reduce oxygen in the container. To do this, open a sealable plastic bag and spread it on top of the kimchi. Carefully pour in the reserved cabbage brine until the bag fills the empty space of your fermentation container. Carefully seal the bag to prevent spillage. korean kimchi recipe fermentation process
    2. Option 2 – You can unpack some of the kimchi and add food-safe objects to fill the empty space of the fermentation crock. Pack the kimchi back around these objects so that the kimchi reaches the top of the container. There are many options for food-safe options that you can use, such as sanitized and non-porous rocks or sanitized ceramic weights.
  6. Cover the fermentation container and place on top of a baking sheet with a lid, or equivalent. Kimchi will bubble and release gas and liquids when fermenting, so this will help with future cleanup.
    • Ceramic fermentation crocks use water seals between the crock and lid. Pour remaining brine into the water seal and place the lid carefully on top to cover.
    • Mason jars can be covered by placing the metal seal on top. Loosely tighten the metal ring until the seal is secure but not tight. This should allow gases to escape the jar when necessary, without knocking the metal seal off the jar entirely.

Step 5: Ferment kimchi

fermenting homemade korean kimchi aging time

  1. Ferment the kimchi by storing the fermentation container in a dark, cool, and undisturbed place. Kimchi takes approximately 1-2 days to start fermenting, depending on the temperature and humidity of where it is.
    • My kimchi is fermented in a hallway closet. I recommend removing anything that you wouldn’t want to smell like kimchi from the area before you start fermenting. The smell of fermenting kimchi is very noticeable and pungent!
  2. After fermentation begins, check on the kimchi regularly. Using a clean utensil, taste the kimchi until it tastes ready to you.
    • How regularly you check on the kimchi depends on your experience with fermentation and the environment you’re fermenting in. Personally, in the early fall, I taste the kimchi after the third day of fermentation, and then every day after until it’s done. I usually stop fermenting after 5-6 days.
    • Please see the kimchi fermentation FAQ at the bottom of this article for more fermentation information. 

Step 5: Safely storing fermented kimchi

  1. Store fermented kimchi in a covered container in the fridge and use as desired. I store finished kimchi in large glass mason jars, but any food safe container with a sealed lid is fine.
  2. Refrigeration slows the fermentation process down significantly. However, kimchi will continue to age in the fridge, becoming increasingly sour over time. Kimchi is eaten at any stage, from fresh to very aged, and is safe to eat for a long time, if it’s stored in the fridge properly. Just don’t eat the kimchi if it’s moldy or looks/smells bad.

Fermented Korean Kimchi Recipe (With Raw Oysters)

Napa Cabbage Kimchi Recipe (With Raw Oysters)

Learn how to make fermented Korean kimchi at home with this homemade kimchi fermentation guide, including a traditional kimchi recipe, step-by-step instructions on the fermentation process, and kimchi FAQ (how long to ferment kimchi).

Course Fermenting, Pickling
Cuisine Canadian, East Asian, Korean, Pacific Northwest, West Coast
Prep Time 3 hours
Total Time 3 hours
Servings 20
Author The Homesteading Huntress

Ingredients

  • 12 pounds napa cabbage
  • 144 grams kosher salt
  • 4 cups water
  • 4 tbsp glutinous rice flour (sweet rice flour)
  • 6 cups daikon, julienned (or 4 cups radish and 2 cups carrots)
  • 14 green onions
  • 2 cups Asian chives (buchu)
  • 1 cup garlic cloves, peeled
  • 2 medium yellow onions
  • 1 cup fish sauce
  • 1/3 cup salted dried shrimp
  • 16 small raw oysters, shelled
  • 4 cups Korean hot red pepper flakes (gochugaru)
  • suitable fermentation container with lid

Instructions

Step 1: Brine cabbage with salt

  1. Slice all the medium-sized napa cabbages in half (vertically). Start by slicing the base of the cabbage in a 2" cut upwards, and then gently pull each half of the cabbage apart to separate

  2. Gently wash cabbage in water and shake dry. 

  3. Sprinkle salt between each cabbage leaf, lifting leaves and concentrating the salt in the cabbage bases and stems where they are thicker. 

  4. Let cabbages rest for 2 hours in large container. Massage, turn, and re-stack the cabbage every 30 minutes to ensure that the cabbages are equally and thoroughly brined.

  5. After 2 hours, the cabbage should be soft and a little translucent. Separate each cabbage half into quarters and rinse under cold water, straining to drain.

  6. There should be a significant amount of liquid brine at the bottom of the container. Reserve the leftover brine.

Step 2: Prepare rice slurry

  1. Pour water and rice flour in a saucepan and mix to incorporate. Turn the stove element on medium heat for 10 minutes and allow the slurry to cook, stirring occasionally. 

  2. After 10 minutes, the rice slurry will start to bubble. Add sugar and cook for another minute, stirring constantly until sugar is dissolved.

  3. Remove from heat and allow to cool to room temperature. 

Step 3: Make kimchi pepper paste

  1. Put garlic, ginger, onion, fish sauce, and salted shrimp into a food processor. Process ingredients until the ginger and garlic are fully broken down. Add gochugaru (hot pepper flakes) and cooled rice slurry and process until it is an evenly mixed red paste. 

  2. Combine pepper paste with sliced radish, green onion, Asian chives, and raw oysters and mix. 

Step 4: Pack kimchi

  1. Using gloves, lift and separate each cabbage leaf to spread kimchi paste throughout the brined cabbage quarters. 

  2. When every leaf is covered in a thin layer of paste, wrap the cabbage quarter into a bundle and pack it tightly into the fermentation crock or other fermentation container. 

  3. Repeat with all cabbage quarters, packing each cabbage bundle tightly into the fermenting container side by side. Press packed bundles down regularly to ensure there are no air pockets or empty spaces in the container. Pack raw vegetable and oyster ingredients between cabbage bundles to incorporate evenly in the fermentation container. 

  4. Spread the remaining kimchi paste on top, pushing any cabbage, other raw vegetable, and oyster ingredients under this layer of pepper paste.

  5. Cover the fermentation container and place on top of a baking sheet with a lid, or equivalent, to make cleanup easier later. 

  6. Ferment the kimchi by storing the fermentation container in a dark, cool, and undisturbed place. See kimchi fermentation FAQ for more details. 

  7. After fermentation begins, check on the kimchi regularly. Using a clean utensil, taste the kimchi until it tastes ready to you. 

Step 5: Safely storing fermented kimchi

  1. Store fermented kimchi in a covered container in the fridge and use as desired.

  2. Refrigeration slows the fermentation process down significantly. However, kimchi will continue to age in the fridge, becoming increasingly sour over time. Kimchi is eaten at any stage, from fresh to very aged.

Recipe Notes

This fermented cabbage kimchi recipe is significantly based on Maangchi’s traditional kimchi recipe with the addition of raw oysters (traditionally added to some kimchis and suitable for BC ingredients) and salted dried shrimp instead of fermented shrimp. 

You don't need to have exactly 12 pounds of cabbage to make kimchi. Learn how to calculate the amount of salt and raw ingredients based how much cabbage you have available to you in the kimchi fermentation FAQ below. 

Please adjust the recipe to retain the correct ratios of raw vegetables versus salt to ensure a safe ferment. 

Making Fermented Kimchi FAQ

korean kimchi recipe - finished fermentation ready to eat

Kimchi Making Process

I don’t have the exact amount of cabbage called for in the kimchi recipe. How do I calculate how much of every ingredient to use based on the amount of cabbage I actually have?

It’s hard to get the exact amount of ingredients called for in a recipe – grocery store scales, cleaning and removing outer leaves, and other factors can all influence how much napa cabbage actually comes home with you when you’re making kimchi.

However, if you don’t have the exact amount of cabbage called for in this recipe (or if you don’t want to make several pounds of kimchi at a time, don’t worry. The most important part of kimchi fermentation is getting the right ratio of raw ingredients to salt.

You just need to calculate how much of each ingredient to use based on how much cabbage you have available to you.

I’m not very good at math, so I always get confused when I read the “fast and dirty” calculations in fermentation forums. I hope this explanation on how to calculate ingredient amounts is clear.

How to customize ingredient measurements for fermenting kimchi:

  1. Divide the amount of cabbage you have (A) by the amount of cabbage called for in the recipe (B). The result is the ratio you have increased or decreased the original recipe by. This will look like: (A)/(B) = (R)
  2. Multiply each ingredient amount in the recipe against the ratio (R) to ensure the correct amount of each ingredient, no matter how much cabbage you have to start. This will look like [ingredient amount in recipe] x (R) = actual amount of ingredient that you need

I don’t have any plastic gloves to make kimchi with. Is wearing gloves really that important for making kimchi at home?

You don’t need to use gloves to make kimchi at home, but you may regret not using them later!

I didn’t use gloves to spread the hot pepper paste into the cabbage leaves when I first made kimchi, and while it didn’t hurt immediately, I did feel an uncomfortable burning sensation in my hands for hours after I was finished.

I was also nervous that I would accidentally touch my face, rub my nose or eyes, or need to use the washroom and end up with a nasty hot pepper surprise.

You don’t necessarily need gloves, but you should probably use them. You can find inexpensive plastic gloves at many dollar stores and most grocery stores.

Fermentation and Fermentation Crocks

Do I have to use a fermentation crock to make kimchi at home?

No, you don’t need to use a fermentation crock to make kimchi at home. I’ve fermented kimchi in large mason jars successfully. I use a 2 L glass mason jar with the lid sitting on top, secured very loosely with the metal ring.

Essentially, the ring has to be loose enough that the fermenting kimchi can release its gasses, which will lift the lid as the gas fills and escapes the jar, but the ring has to be tight enough that the lid falls back to cover the jar after the gas escapes.

I’ve heard you can pack it into a container with a lid and ferment it slowly in the fridge. Some people don’t even ferment kimchi at all – you can eat it fresh, right after you make it, too!

Where can I buy an affordable fermentation crock?

You can find many varieties of fermenting crocks online, though they can vary wildly in price.

However, if you live in a place with a large East Asian community, you have a good chance of being able to buy an affordable fermentation crock. Many Asian cultures have long histories with fermentation, such as Chinese pickles, Japanese miso, and obviously, Korean kimchi.

I bought my crock in a kitchen supply store that caters to Chinese restaurants in Vancouver’s Chinatown for $26. Make sure you know the traits you want in a crock before you buy one!

My crock is glazed ceramic, hefty, and reliable with a water-tight lip and solid lid. I’m very satisfied with my crock purchase, especially compared to the other option, the popular $200+ German fermenting crocks that seem to do the exact same thing!

If you buy a fancy German crock, tell me how it is – I’m curious to see whether they’re different than my Chinatown version.

How long do I ferment kimchi for in a fermentation crock? When do I know when kimchi is done fermenting?

Fermentation times can change depending on the storage temperature and humidity, how much kimchi you’re fermenting, and how funky you want the kimchi to taste.

Checking your ferments is a trade-off between knowing when the kimchi is finished fermenting versus exposing the fermenting ingredients to the air, which can interfere with the ferment. Some experienced fermenters are very minimal with how often they open their fermentation crocks to check their ferments, while other people are more liberal with their check-ins.

However, the easiest and most reliable way to know if your kimchi is done fermenting is to smell and taste it regularly. Don’t be scared – as long as you have the right salinity, you’ll be fine. Plus, kimchi doesn’t need to be fermented, so it’s safe to eat at any point during the fermentation stage. 

I start smelling the kimchi everyday, starting after the first full day of fermentation. I generally start tasting the kimchi after the third day of fermenting, and then every day after until I think it’s done.

I usually stop fermenting kimchi after 5-6 days in early fall. It is usually between 10-15 degrees celsius outside during this time of year. I also keep my home fairly cool when I’m actively fermenting something.

However, this timeline is based on personal preference. I prefer kimchi to be pleasantly sour, acidic, very slightly carbonated, and pungent, but still crunchy and fresh tasting. You may like your kimchi to be more or less fermented tasting – it’s up to you! 

Can I ferment kimchi anytime during the year?

Fermentation is easier during colder seasons, as fermentation is slower in cool temperatures, and allows for more predictable and controlled bacterial growth and a well-rounded flavor. Fermentation during these periods takes longer, but the results are more consistent.

Where I’m located in BC, fall, winter, and early spring are best for fermenting. I look for weather consistently below 14 degrees. I also don’t heat my home very much when I’m fermenting food.

However, it’s possible to ferment kimchi and other pickles during hotter seasons, as long as you can maintain a temperature controlled area for your crock to remain in until the fermentation is done.

What is the best place to put my fermentation crock after I fill it with fresh kimchi?

I keep my crock in a small, unlit coat closet, but you can keep the crock anywhere dark and consistently cool. Other common places to ferment kimchi are in basements, garages, and closets.

Fermenting kimchi can smell strong, so if you use a closet like I do, make sure to take out anything you wouldn’t want to smell like kimchi. Don’t forget to put something underneath the crock or jar to catch any liquid that may come out of the container!

If you aren’t sure whether a space is cold enough to ferment in, you can leave a glass filled with room temperature water in the space overnight, and then test the temperature with a thermometer to see how cold it is.

Why is the kimchi bubbling? Why does the fermentation crock feel a little warm?

Bubbles in kimchi are a good sign during fermentation!

Bubbles indicate that the various lactic acid bacteria (LAB) and other bacteria, yeasts, and fungi that contribute to the flavors and textures of kimchi are working to convert the sugar in the raw ingredients to lactic acid, acetic acid, ethanol, carbon dioxide, and so on.

This process of lactic acid fermentation also increases temperature, which is why the fermenting crock may feel a little warm.

Adjusting For Taste

The kimchi tastes too spicy when I taste it out of the crock. How do I make it less spicy?

When you’re tasting kimchi during fermentation, you may find it’s too spicy for you.

It’s common to only taste-test from the top part of the crock, which has the largest concentration of pepper paste. This can make the kimchi seem much spicer than it actually is underneath. Try tasting below the initial layer of pepper paste to evaluate the spice level of your kimchi.

After fermentation, you may find that the kimchi is still too spicy. If that is the case, you can add slices of raw daikon or other suitable vegetables to dilute the pepper paste after the fermentation process is done, when you store the kimchi in the refrigerator.

The kimchi tastes too salty. How do I make it less salty?

The amount of salt is specific to the amount of raw vegetables in the recipe. You need to maintain ideal salinity during fermentation to create the correct environment for the lactic acid and other good bacteria, yeasts, and fungi to flourish, and to prevent the growth of bad bacteria (such as botulism). It’s important to maintain the recipe ratios when you ferment kimchi.

However, if the kimchi still tastes too salty after you’re finished fermenting it, there is a solution. You can add slices of raw daikon or other suitable vegetables to dilute the amount of salt when you store the kimchi in the refrigerator. Do not dilute the kimchi during the fermentation process.

Kimchi Storage

How do I store the kimchi when it’s finished fermenting?

You can store kimchi in the refrigerator in containers with tight fitting lids, such as mason jars or other food safe containers.

Pack kimchi down tightly and fill containers up to the lid, if possible, to reduce the amount of exposure it has to air. This will keep the kimchi fresh for longer.

How long does fermented kimchi stay good for? When does kimchi go bad?

Kimchi can stay good in the fridge for several months or longer, as long as it has no unusual growths, it looks like kimchi, and smells like kimchi.

Kimchi becomes more sour and fermented tasting the longer you leave it in the fridge. Older kimchi is strong tasting and is great in Korean soups, like kimchi jigae and soon dubu jigae.

I’m not a food safety scientist, though. Always use your best judgement when eating DIY fermented foods!

Kimchi Recipes

fermented Korean kimchi recipe - kimchi and elk example

How am I going to eat all this kimchi?

Kimchi is great in traditional Korean dishes and in all sorts of other recipes and meals.

My favorite ways to eat kimchi:

Note: These are the opinions and anecdotes of The Homesteading Huntress. I am not a food scientist or certified safety expert. I always eat the fermented foods I make before I share fermentation processes and my own experiences. Please take the time to learn about fermenting safely before you experiment with fermentation.

Posted by Arielle

Arielle is a passionate urban homesteader and hunter located in Vancouver and the Sunshine Coast of British Columbia.

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