Fermented foods are having a moment, but kimchi has been having its moment for over a thousand years. Making your own kimchi at home is easier than most people think, takes about an hour of active work, and produces a product that is genuinely better than anything you can buy in a jar. Here is everything you need to know to make your first batch.
Kimchi fermentation is driven by lactic acid bacteria naturally present on the cabbage leaves. When you salt the cabbage, you draw out water and create a brine. When you add the seasoning paste and pack everything tightly into a jar, the bacteria get to work converting sugars into lactic acid, which lowers the pH and preserves the kimchi while developing that characteristic tang. At room temperature (around 65-70 degrees Fahrenheit), kimchi will ferment noticeably within 24-48 hours -- you will see small bubbles forming and the flavor will become tangy and complex. Then you move it to the refrigerator, where fermentation slows dramatically but continues for months. Most people prefer kimchi at different stages: freshly made kimchi is crisp and mildly spiced; one-week-old kimchi is tangier and slightly softer; month-old kimchi is deeply sour and ideal for kimchi jjigae stew or fried rice. The only equipment you need is a large bowl for salting, a jar with a loose-fitting lid (or burp it daily), and gloves for mixing in the gochugaru -- the Korean red pepper flakes that give kimchi its color and mild heat. Gochugaru is non-negotiable; regular chili flakes produce a completely different flavor profile.