Make a 3-inch incision in the middle of the cabbage at its base. For the traditional method, you don’t have to wash the cabbage in the beginning unless it's super dirty since it will be thoroughly washed after the brining process.
Use your hands to break the cabbage in half.
Make a 2-inch incision at the end of each half. You can either break into quarters here or do it after brining and washing is done. In the video, we quartered it in the beginning.
Make salt solution. 1 part salt, 8 part water. Must use coarse sea salt. Filtered water is best but tap water works OK.
Submerge a cabbage piece in the salt water ensuring all parts of the cabbage are wet. Take it out of the water and set it aside. If you are making 1 cabbage, there won't be enough water to submerge the cabbage. So you can try to wet every part of the cabbage by placing it in the bowl and pouring the solution over it with a cup as shown in the video. Repeat the same process with all cabbage pieces. Don't throw out the brining solution.
Sprinkle salt on each each layer of the cabbage pieces, focusing mainly on the white stems. Start from the bottom layer and go through each layer. Then repeat for each cabbage piece. We used 1/4 cup of salt for the WHOLE 4 lb nappa cabbage (1 TBS for each quarter) for 24 hour brining. If you use more salt, it will be brined faster. (e.g, double salt -> 10 hour brine but varies depending on the salt and temperature)
The white stems need more salt because of their thicker texture. The leaves will soften quickly, while stems take more time.
Place all cabbage pieces in a large bowl or roasting pan, cut side facing up and in one or two layers.
Pour any left over brining solution around the edges into the bowl.
Then, cover with a lid or cling wrap and let it sit at room temperature.
After 3-4 hours, rotate the top and bottom cabbages. After 6-8 hours from the beginning, rotate the top and bottom again and flip the cabbages so the cut part is facing the bottom. As time passes, more liquid will form at the bottom. Leave the liquid as is.
You can keep rotating every 3-4 hours. Try to move it around so thick white stem parts are in the liquid more than the think green parts as it will take longer for white part to be brined.
We brined for 24 hours but depending on the amount and type of salt you use, it can be anywhere from 10 to 24 hours. Also, the colder it is, the longer it will take and the hotter it is, the faster it will be brined.
When all the parts of the cabbage is easily bent, the brining is done. Then thoroughly wash the cabbages 3 or more times. If it's too salty after washing, you can soak in water and wash more until desired saltiness. It's better to be over brined than under because you can always fix over brining by soaking in water. After washing, it should take a little bit saltier than you'd like as it ferments saltiness will be reduced a bit.
Drain all the water out by placing the cabbage upside down in a strainer for 2 to 5 hours. Not draining properly could result in undesirable flavors. There should be some space between the bottom of the strainer and the surface of the sink so the water can escape.