Chess Pie
["1/2 c. butter or margarine, melted", "1 1/2 c. sugar", "3 eggs", "1 Tbsp. vinegar", "1 tsp. vanilla"]
["Whip together and pour into unbaked pie shell.", "Bake at 350\u00b0 for 45 minutes."]
["butter", "sugar", "eggs", "vinegar", "vanilla"]