Vinegar Pie
["1/4 lb. butter, melted and cooled", "1 1/2 c. sugar", "2 Tbsp. flour", "1 Tbsp. vanilla", "2 Tbsp. vinegar", "3 eggs", "1 (9-inch) unbaked pie shell"]
["Combine first 6 ingredients, blend well and pour into pie shell.", "Bake at 300\u00b0 for 45 minutes."]
["butter", "sugar", "flour", "vanilla", "vinegar", "eggs", "shell"]