In Traditional Chinese Five Element Theory (TCM), the flavor of Spring is sour. The sour flavor and the wood element influence the liver and gall bladder. Sour foods include vinegar, sauerkraut (and other lacto-fermented vegetables), lemon, rye, turnips, greens, quinoa, fennel, and caraway seeds. Sourness has an astringent and consolidating effect in the body. It can control diarrhea and excess perspiration or help focus a scattered mind.

Sauerkraut

Time frame: 1-2 weeks
You will need:
                Ceramic crock or food-grade plastic bucket, one-gallon capacity or greater
                Plate that fits inside crock or bucket
                One-gallon jug filled with water (or a scrubbed and boiled rock)
                Cloth cover (pillowcase or towel)
                5 pounds cabbage
                3 tablespoons sea salt
 
Chop or grate cabbage, finely or coarsely, with or without hearts, however you like it. I love to mix green and red cabbage to end up with bright pink kraut. Place cabbage in a large bowl as you chop it. Sprinkle salt on the cabbage as you go. The salt pulls water out of the cabbage (through osmosis), and this creates the brine in which the cabbage can ferment and sour without rotting. The salt also has the effect of keeping the cabbage crunchy, by inhibiting organisms and enzymes that soften it. 3 tablespoons of salt is a rough guideline for 5 pounds of cabbage.

Mix ingredients together and pack into crock. Pack just a bit into the crock at a time and tamp it down hard using your fists or any (other) sturdy kitchen implement. The tamping packs the kraut tight in the crock and helps force water out of the cabbage.
 
Cover kraut with a plate or some other lid that fits snugly inside the crock. Place a clean weight (a glass jug filled with water) on the cover. This weight is to force water out of the cabbage and then keep the cabbage submerged under the brine. Cover the whole thing with a cloth.
 
Press down on the weight to add pressure to the cabbage and help force water out of it. Continue doing this periodically (as often as you think of it, every few hours), until the brine rises above the cover. This can take up to about 24 hours, as the salt draws water out of the cabbage slowly. Some cabbage, particularly if it is old, simply contains less water. If the brine does not rise above the plate level by the next day, add enough salt water to bring the brine level above the plate. Add about a teaspoon of salt to a cup of water and stir until it’s completely dissolved.
 
Leave the crock to ferment in a corner of the kitchen. Check the kraut every day or two. The volume reduces as the fermentation proceeds. Sometimes mold appears on the surface. Skim off what you can and don’t worry about it. It’s just a surface phenomenon. The kraut itself is under the anaerobic protection of the brine.
 
Rinse off the plate and the weight. Taste the kraut. Generally it starts to be tangy after a few days, and the taste gets stronger as time passes. Store in jars in the fridge for up to 1 year.

Gratitude to Sandor Ellix Katz for guidelines from his book, The Art of Fermentation (Chelsea Green, 2012)