1 Baked 9-inch pie crust
1 cup water
1 cup sugar
1/2 cup butter
1 egg
1 tsp. vanilla extract
2 tbsp. vinegar
3 tbsp. flour

Bring water to a boil and add sugar, butter, egg, vanilla, vinegar and flour. Cook over low heat until thick. Pour into prepared pie crust and let cool. Serve with whipped cream.