Tuna Stuffed Mushroom  Caps
["1 lb. fresh large mushrooms", "1/3 c. minced onion", "1 can tuna", "1/4 c. butter", "1/2 c. minced celery", "mayonnaise or salad dressing"]
["Wash mushrooms.", "Carefully remove stems from caps.", "Chop stems. Melt 1 tablespoon butter in frying pan.", "Saute chopped stems. Cool.", "Drain tuna.", "Separate into small pieces in bowl with fork. Mix in onion, celery and cooked stems.", "Add mayonnaise or salad dressing until mixture holds together, but is not loose.", "Chill."]
["fresh large mushrooms", "onion", "tuna", "butter", "celery", "mayonnaise"]