Vinegar Pie

Directions

1. 1
   Mix 1 1/4 cups sugar and cornstarch in a saucepan.
2. 2
   Stir in water, vinegar, and butter.
3. 3
   Cook over medium heat, stirring constantly until thick.
4. 4
   Remove from heat.
5. 5
   In a small dish, beat egg yolks into a small amount of mixture, then add this back to the saucepan.
6. 6
   Return to heat and cook 3 minutes more.
7. 7
   Pour into the pie shell.
8. 8
   Cool.
9. 9
   In a medium bowl, beat egg whites with cream of tartar; gradually add the other 1/4 cup sugar.
10. 10
    Beat until stiff. Spread over pie and bake at 350° for 10 to 15 minutes.