Braune Bohnensuppe [Brown Bean Soup]

3 quarts water;
1 1/2 cups pinto beans;
1 large sweet potato, diced;
salt and green onion to taste
small ham bone or cubed salt pork

For the dumplings;
2 eggs;
2 tablespoons water;
1 cup flour or more to make soft dough

Cook beans until soft, about 3 hours. If soaked 
overnight, cooking time will be shorter. Add ham 
bone and cook for 30 minutes. Add potato, salt, and
chopped onion tops. Cook 30 minutes more. Drop in
dumplings by teaspoon, 15 mintues before serving. 

Servers 6 to 8