Vinegar Pie
["1 c. water", "2 Tbsp. vinegar", "2 Tbsp. flour", "1 c. sugar", "2 eggs, beaten", "1 tsp. butter", "1/4 tsp. lemon flavoring", "1 (9 inch) baked pie shell"]
["Combine water, vinegar, flour, sugar and eggs in top of double boiler. Cook until thickened and smooth, stirring often. Add butter and lemon flavoring. Pour into pie shell. To serve, top with whipped cream."]
["water", "vinegar", "flour", "sugar", "eggs", "butter", "lemon flavoring", "shell"]