Place the shredded cabbage little by little in your fermentation jar, pounding them vigorously and sprinkling some of the sea salt as you go.
4 or 5 heads of red or green cabbage, ¼ cup sea salt
Make sure the mixture fills the jar up to 1 inch bellow the top (because of the expansion), adding more if needed, and that the extracted water covers the vegetables entirely. If not, create a brine of 2 tablespoons sea salt to 4 cups water and add it to the cabbage.
Press the vegetables and keep them under the brine by placing a plate or a lid on top weighted down by a rock or a jug of water. Cover with a clean towel if needed to keep out fruit flies.
Place the fermentation jar in a warm spot in your kitchen and allow the Sauerkraut to ferment for 7 to 10 days.
Check on it from time to time to be sure that the brine covers the vegetables and to remove any mold that may form on the surface.
A good way to know when it’s ready is to taste it during the fermentation process and move it to the refrigerator when you’re satisfied with the taste.