Vinegar Pie - cooking recipe

Ingredients

1 c. sugar
2 eggs, beaten
2 Tbsp. vinegar
2 Tbsp. flour or cornstarch
1 c. water
1 Tbsp. butter
1/2 tsp. lemon extract
1 (9-inch) baked pie shell

Preparation

Combine sugar, eggs, vinegar, flour or cornstarch and water in top of double boiler.
Cook until thick and smooth, stirring occasionally.
Just before removing from heat, stir in butter and lemon extract.
Pour into baked pie shell.
Refrigerate until completely cooled.
May be topped with whipped cream.