Sweet & Sour Red Cabbage

1 small head red cabbage (1 pound), washed and shredded
1 medium apple, unpeeled, scrubbed, cored and shredded
1 small potato, peeled and shredded
1 onion, peeled and chopped
1 cup water
grated peel of 1/2 lemon
juice of 1 lemon
3 tablespoons brown sugar
1 tablespoon vinegar

In a large covered non-stick skillet, cook cabbage, apple, potato, and onion in water over low heat for 15 minutes.  Stir occasionally.  Add remaining ingredients.  Cover and cook over low heat 10 minutes longer, until vegetables are tender and mixture slightly thickens.  Stir often.