Grandma E'S Famous Sloppy Joes - cooking recipe

Ingredients

1 Tbsp. butter
1/2 c. ketchup
2 Tbsp. vinegar
2 Tbsp. brown sugar
2 tsp. mustard
1 c. water
4 tsp. flour
1 1/2 to 2 lb. cooked hamburger

Preparation

Mix water with flour. Add sauce and cook until thick (boil about 2 minutes). Add to cooked hamburger.