Find a big glass bottle, wash it and dry it. Appropriate amount of Chinese cabbage, washed, shredded, put into a basin, add a little salt, knead well, and stuff into a bottle until full and firm. Seal the bottle mouth with plastic wrap, and then tie it tightly with string so as not to leak. Put it in the shade, and you can eat delicious sauerkraut in a month. It must take a month, not' fast'. Because after a month, there will be no' nitrite'.