Hamburger Steaks with Gravy

1 lb hamburger
1 egg, beaten
1/2 C cereal crumbs
2 T catsup
2 T water
1 T Worcestershire sauce
1/4 tsp chopped onion
1/2 tsp salt
Pepper to taste
1 can mushroom soup

Mix all ingredients in order except soup.  Form into large patties and roll lightly in flour.  Brown both sides in butter.  Pour soup with one can water over meat patties and simmer covered for 45 minutes.