This kimchi recipe begins by mixing the salt with the water, stirring to dissolve. Now just add the cabbage and marinate it overnight.
The next morning, strain the cabbage and rinse well. You want to remove all of the salt. Let sit in a colander for a few minutes to drip the rest of the moisture out of it.
Place the kimchi in jars and tighten the lid. Be sure to leave about a half-inch of headspace at the top. Kimchi tends to release gasses as it ferments. Let this sit on the counter for about 3 days. I "burp" the lids every day to prevent blowouts. I have not had a jar break, but the fear is real! You can also use these fermenting lids.
After three days, test your kimchi recipe. You can leave it a bit longer to make it sourer or add more pepper flakes to increase the heat. I like to add some cucumber or zucchini at this point. I find that if I add it too soon, that it can get mushy.
This is my base kimchi recipe; feel free to vary the ingredients to suit your tastes.
Other vegetables that you can use are sweet potatoes, dinner radish, green beans, parsnips, turnips, sunchokes, or bamboo shoots. Fragile produce like tomatoes will turn to mush as well, so I avoid them.
I will sometimes take a few strands of lemongrass and tie them together, then leave them in the ferment. This imparts a nice lemony flavor.