Vinegar Pie
["1 c. sugar", "1 tsp. butter", "2 Tbsp. flour", "3 Tbsp. vinegar"]
["Mix together sugar, flour and butter.", "Put vinegar into a pint cup.", "Fill cup with water and add to the mixture.", "Pour into an unbaked pie crust.", "Bake in moderate oven at 350\u00b0 until done."]
["sugar", "butter", "flour", "vinegar"]