Ashitibichi (Buta Ashi no Shiru) Pig’s Feet Soup

1-1/2 cups uncooked red beans1 linguesa or soup bone1 medium-sized cabbage (chopped)1 carrot (diced)2 potatoes (diced)1 sweet potato (diced)1/3 bunch watercress (chopped)1 8-oz. can tomato sauceSalt to taste Soak beans overnight in water or wash and soak beans for 1-1/2 hour in 1 cup boiling water and enough cold water to cover. Cover with lid…