Sloppy Joes - cooking recipe

Ingredients

1 lb. ground beef
1 medium onion, chopped
1/2 c. catsup
2 tsp. mustard
2 tsp. vinegar
2 Tbsp. brown sugar
1 tsp. margarine
2 tsp. flour

Preparation

Brown ground beef and onion.
Drain.
Mix rest of ingredients in small bowl while browning ground beef.
Mix with ground beef and simmer for 20 minutes.