You probably already know kimchi as that tangy, spicy Korean side dish. But the flavour, the colour, the whole soul of kimchi lives in one ingredient: Gochugaru, the Korean chili powder that is smoky-sweet, mildly hot, and vibrant red. Without it, you are making spicy cabbage. With it, you are making kimchi.
Ingredients
- 1 medium napa cabbage (about 1kg)
- 30g sea salt
- 3 tbsp Gochugaru Chili Powder
- 3 garlic cloves, finely grated
- 1 tsp fresh ginger, grated
- 3 spring onions, sliced
- 1 tbsp fish sauce (or soy sauce for vegan)
- 1 tsp sugar
Method
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Salt the cabbage: Quarter the cabbage lengthways, cut into rough 5cm pieces. Toss with salt in a large bowl. Let it sit for at least 2 hours, turning occasionally. The cabbage should soften and release its liquid. Rinse well under cold water and squeeze dry.
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Make the paste: Mix gochugaru, garlic, ginger, fish sauce, and sugar into a paste. Taste it. It should be intense, garlicky, and spicy.
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Massage: Add the spring onions to the cabbage. Add the paste. Use gloves and massage everything together for 2 to 3 minutes until every leaf is coated and glistening red.
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Pack the jar: Push the kimchi firmly into a clean glass jar, pressing down so the brine rises above the cabbage. Leave 3 to 4cm of space at the top. Close the lid.
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Ferment: Leave the jar at room temperature (18 to 22°C) for 2 to 5 days. Open daily to release gas and press the cabbage back under the brine. Taste from day 2. When pleasantly tangy and slightly fizzy, move it to the fridge.
Chef's Tip
Do not skip the salting step. It draws out the water that becomes the brine, and that brine is what keeps the fermentation anaerobic and safe. Too little salting and your kimchi won't ferment properly. Too much and it tastes like salt. 30g per kilo of cabbage is the ratio to trust.
Why Gochugaru Makes Authentic Kimchi
Gochugaru isn't just heat. It's a Korean sun-dried red chili with a flavour profile no other pepper can match: smoky, slightly sweet, fruity at the edges, with warmth that builds rather than burns. The flakes are coarse enough to coat every cabbage leaf without turning into a paste, and the colour is that deep, glowing red you see in every Korean market.
Regular chili flakes taste sharp and one-dimensional. Gochugaru tastes complex. It ferments beautifully, mellowing as the kimchi develops, adding layers instead of just heat. That's why every traditional kimchi recipe calls for it by name.
How Fermentation Works
Kimchi is alive. You are not cooking it, you are creating the conditions for good bacteria to transform salted cabbage into something tangy, complex, and slightly fizzy.
| Day |
What's happening |
Taste |
Storage |
| 1 to 2 |
Lactobacilli multiply, fermentation starts |
Fresh, mild heat, crunchy |
Room temperature, burp jar daily |
| 3 to 4 |
Active fermentation, bubbles visible, brine cloudy |
Tangy developing, slight fizz |
Taste daily to check progress |
| 5+ |
Fermentation slows, flavour deepens |
Full tangy-sour, complex, still crunchy |
Move to fridge |
The magic is in the timing. Too short and it's just spicy salad. Too long at room temperature and it gets mushy. Taste it every day from day 3 onwards. When it hits that sweet spot of tangy, crunchy, and alive, refrigerate it.
Temperature is everything. Warmer rooms ferment faster. In summer your kimchi might be ready in 2 days. In winter, it could take 5. Trust your taste, not the calendar.
5 Ways to Use Your Homemade Kimchi
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Kimchi Fried Rice: Chop aged kimchi, fry in sesame oil with day-old rice, top with a fried egg. The older, sourer kimchi works best here.
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Kimchi Jjigae (Stew): Simmer kimchi with pork belly, tofu, and a pinch of extra gochugaru. Serve with steamed rice. This is where kimchi that has been in the fridge for weeks shines.
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Kimchi Grilled Cheese: Layer kimchi and cheese between buttered bread, grill until crispy. The heat mellows the tang and caramelises the edges.
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Ramen Topper: Add a heap of kimchi to instant ramen or homemade broth. The acidity cuts through the richness and the gochugaru adds another layer of heat.
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Kimchi Pancakes (Kimchijeon): Mix chopped kimchi into a simple flour-and-water batter, fry until crispy. Serve with a soy-vinegar dipping sauce.
Kimchi is one of those things that gets better the more you make it. The first jar teaches you the rhythm. What will you put your kimchi on first?
Frequently Asked Questions (FAQs)
What is gochugaru and can I substitute it?
Gochugaru is Korean red chili powder with a mild, smoky-sweet flavour. You can substitute with crushed red pepper flakes, but the taste will be sharper and less complex. For authentic kimchi, gochugaru is essential.
How long does kimchi need to ferment?
Kimchi ferments at room temperature for 2 to 5 days depending on how tangy you want it. After that, move it to the fridge where it continues to ferment slowly for weeks.
How do I know when kimchi is ready?
Taste it daily. When it's pleasantly tangy with a slight fizz and the cabbage is still crunchy, it's ready. The flavour develops more in the fridge over time.
How long does homemade kimchi last?
Properly stored in the fridge, homemade kimchi lasts 3 to 6 months. The flavour becomes more intense and sour as it ages, which is perfect for cooking.
Can I make vegan kimchi without fish sauce?
Yes. Replace fish sauce with soy sauce or miso paste mixed with a pinch of sugar. The umami depth will be slightly different but still delicious.
