Hot Roast Beef Sandwich - cooking recipe

Ingredients

1 Tbsp. chopped onion
1 Tbsp. butter
2 Tbsp. flour
1 1/2 c. milk
roast beef slices
hot toast (optional)
bread slices (optional)

Preparation

Brown onion in butter in skillet.
Add flour; stir until brown.
Gradually add milk.
Stir and cook until thick.
Add meat slices; cook 10 minutes or until thoroughly heated.
Place between slices of bread, or on hot toast with gravy.