Tokwa Croquettes

1/4 cup chopped onion
2 tablespoons margarine
2 tablespoons flour
1/2 cup milk
2 1/2 cups finely chopped tokwa
1 slightly beaten egg
1/2 cup shredded cheese
1/2 teaspoon salt
1 cup toasted bread crumbs

Cook onion in margarine till tender, blend in flour. Add milk, cook and stir until mixture thickens and bubbles. Add remaining ingredients. Chill several hours. Shape into patties. Roll in crumbs. Brown in hot oil.