Vinegar Pie

Directions

1. 1
   Beat egg yolks until thick.
2. 2
   Add 1 cup sugar, flour and salt. Mix thoroughly.
3. 3
   Add boiling water slowly, stirring constantly. Add vinegar.
4. 4
   Cook over hot water until thick and smooth.
5. 5
   Add salt and flavoring.
6. 6
   Pour into baked pie shell (9-inch).
7. 7
   Cover with meringue made from egg whites and 3 tablespoons sugar.
8. 8
   Bake in 325° oven for 20 minutes.