1 lb. ground beef
1/2 c. chopped onion
1 tbsp. shortening
1 can cream of mushroom soup
1 tbsp. prepared mustard
1/2 tsp. pepper
6 buns, split & toasted

In skillet, brown beef and cook onion in shortening until tender, stir to separate meat. Drain off fat. Add soup and seasonings. Cook 5 minutes, stir now and then. Makes 6 sandwiches.