1 c. sugar
1/2 c. flour
3 tbsp. butter
3 tbsp. vinegar
2 c. water
Pinch of salt
1 baked pie shell

Combine sugar and flour in heavy saucepan. Add water, a little at a time, stirring well as not to get lumpy. Add vinegar, butter and salt. Stir and cook over medium heat until thick. Pour into a baked pie shell.