Hamburger And Gravy

1 lb. hamburger
1/4 Teaspoon meat tenderizer
2 bay leaves
1 Tblsp ketchup
2 cups water
1 small onion, chopped
2 Tblsp flour
2 bouillion cubes (beef)
1/4 Teaspoon Gravy Master

Brown hamburger meat with chopped onion and meat tenderizer. Add flour; stir
until blended. Add water slowly, then add the remaining ingredients. Turn
the heat down to a simmer and cook for 1/2 hour.