Place the water and shiitake in a saucepan, cover and bring to a boil. Reduce the flame to low and simmer 3 to 5 minutes. Remove shiitake and set aside. Place onions in water and simmer 1 minute. Remove and set aside. Remove the water from the flame and allow to cool to room temperature. When cool add the shoyu to the water and mix. Place the onions and shiitake in a clean glass jar and pour the shoyu seasoned water over. Cover the top of the jar with a piece of clean, cotton cheesecloth, securing it with a rubber band or piece of string. Set the jar on the counter and leave for 24 hours to ferment. After 24 hours remove the cheesecloth and place the jar lid on securely. Refrigerate until ready to eat.
One serving is approximately 1 tablespoon. Rinse only the portion you want to eat to remove excess sodium, and refrigerate the remainder. These pickles will keep, refrigerated, for approximately 10 days to 2 weeks. The pickling brine may be reused, but add a little more shoyu to replenish sodium that the previous vegetables absorbed.
Homemade, non-pasteurized pickles are a source of beneficial enzymes that aid in digestion. Be careful not to eat too many at a time as they are salty.
Per serving - 13 calories, 0 g fat (0% calories from fat), 2 g protein, 6 g carbohydrate, 3 g fiber, 0 mg cholesterol, 250 mg sodium