Mini Reubens - cooking recipe

Ingredients

1 stick margarine
1 small onion, grated
1/2 Tbsp. Worcestershire sauce
1 1/2 Tbsp. mustard
1 1/2 Tbsp. poppy seed
1 (12 oz.) can corned beef
Mozzarella cheese
Pepperidge Farm party rolls

Preparation

Mix together the first 5 ingredients.
Split rolls in half and spread each side with mixture.
Put corned beef on roll, then top with cheese.
Heat until cheese is melted.