1 lb. ground beef
2 tbsp. flour
6 tbsp. catsup
1 tbsp. prepared mustard
1/2 tsp. salt
1/4 tsp. pepper
1 c. sour cream
1/2 c. chopped onion

Brown ground beef and chopped onion. Drain off fat. Mix remaining ingredients together in small bowl. Add to meat. Simmer 5-10 minutes to thicken. Serve on heated buns. 6-8 servings.