Hamburger Pie
["2 Tbsp. vegetable oil", "1 c. onions, chopped", "1 c. celery, chopped", "3/4 tsp. salt", "1 lb. ground beef", "1 c. potatoes, cubed", "2 c. tomatoes, lightly mashed", "1 unbaked pie crust, cut into strips"]
["Slowly cook oil, onions, celery, salt and beef, stirring constantly.", "Add potatoes and tomatoes; stir well. Place in casserole dish. Place strips of pastry on top.", "Bake at 425\u00b0 for 30 to 40 minutes."]
["vegetable oil", "onions", "celery", "salt", "ground beef", "potatoes", "tomatoes", "crust"]