Hamburger And Potato Pie
["3 Tbsp. chopped onions", "1 Tbsp. butter or oil", "1 lb. ground beef", "1 (16 oz.) can tomatoes", "1 1/2 tsp. salt", "1 tsp. paprika", "1/4 tsp. pepper", "1 egg yolk", "2 Tbsp. melted butter or margarine", "3 c. seasoned mashed potatoes"]
["Saute onions in butter.", "Add beef and brown well.", "Stir in tomatoes and seasonings.", "Pour into a quart casserole.", "Combine potatoes, egg yolk and butter.", "Beat until light and fluffy. Spread over meat mixture in casserole.", "Bake at 400\u00b0 for 30 minutes or until brown.", "Makes 4 to 5 servings."]
["onions", "butter", "ground beef", "tomatoes", "salt", "paprika", "pepper", "egg yolk", "butter", "potatoes"]