1 stick butter
1/4 c. mustard
1/4 c. minced onion
1 lb. shaved deli ham
1 lb. Mozzarella cheese, sliced
3 pans ready to serve finger rolls

Saute onion in butter. Add mustard. Split each pan of rolls and brush both sides with mixture. Layer on cheese and ham. Return to roll pan and cover with foil. Heat in 350 degree oven until cheese is melted. Cut into individual sandwiches.