Ham Oven Sandwiches
["1/2 lb. soft butter", "2 Tbsp. mustard", "1 1/2 Tbsp. poppy seed", "1 tsp. Worcestershire sauce", "1 medium onion, grated fine"]
["Divide 1 pound chipped ham over the buns and 1 thin slice of Swiss cheese.", "Wrap in foil and heat in 400\u00b0 oven for 15 minutes. Serves 12."]
["butter", "mustard", "poppy seed", "Worcestershire sauce", "onion"]