Kimchi is a living fermented food.

Therefore, how you manage temperature, time, and salinity completely determines the flavor.

Understand How Fermentation Works

• Lactic acid bacteria consume the sugars in cabbage and produce lactic acid, creating a sour taste.

• If the temperature is high, lactic acid bacteria multiply rapidly, causing it to sour quickly; if low, it ferments slowly, allowing for longer storage.

• When the pH drops below 4.2, most harmful bacteria cannot survive, making it hygienically safe.

Fermentation Temperature: 4-6°C, Storage Temperature: Around 0-2°C

• Initially, fermenting at around 5°C for a day or two will evenly distribute the flavor throughout the cabbage.

• For kimchi that you want to eat quickly, keeping it at 6-8°C for half a day to a day will enhance the sourness.

• When the flavor is just right, quickly lower the temperature to 0-2°C to almost stop fermentation, preserving the crunchiness.

Adjust Slightly Based on Kimchi Type

• Napa cabbage kimchi and cubed radish kimchi: Use the basic temperatures mentioned above.

• Young radish kimchi: For a refreshing broth, ferment quickly at around 6°C.

• Dongchimi and water kimchi: For a clear broth flavor, ferment slowly at low temperatures of 2-4°C.

• Baekkimchi: If you want to delay sourness and enhance sweetness, long-term fermentation at 1-3°C is ideal.

Small Tips for Using a Kimchi Refrigerator

• Store in a dedicated container with as much air removed as possible to prevent surface drying and mold.

• If you keep opening and closing one container, the temperature fluctuates, so it's convenient to portion out about a week's worth into another airtight container.

• After making kimchi, leave it at room temperature for about 12-24 hours before moving it to the refrigerator; this helps the lactic acid bacteria start well, enhancing the flavor.

• If your refrigerator has a slushy mode (around -1°C), use it to prevent kimchi from souring too quickly.

If You See This While Storing, Here's How to Respond

• If there is overflow or excessive bubbles → The container is too full or the temperature is too high. Remove some and lower the temperature by 1-2°C.

• If a white mold film appears on the surface → This means the exposed area has dried out. Remove the top layer and add a little kimchi broth to restore cleanliness.

• If it has become too sour → Adding a little sugar or broth while cooking can neutralize the sourness, making it palatable.

Remember that small temperature differences can significantly change the flavor when using a kimchi refrigerator!