Swiss Steak

1 (1 1/2 to 2 pound) round steak
1 large onion, chopped
Salt and pepper, to taste
Flour
3 tablespoons vegetable oil
2 cups tomatoes
1 cup water

Cut steak into serving-size pieces. Salt and pepper steak, dredge in flour and pound flour into steak.

Brown steak in oil in a large cast iron skillet, then remove from skillet. Saut