Old-Fashioned Vinegar Pie

Directions

1. 1
   Combine sugar, eggs,
2. 2
   vinegar, flour or cornstarch and water in double boiler.
3. 3
   Cook
4. 4
   until
5. 5
   thickened
6. 6
   and
7. 7
   smooth, stirring occasionally.
8. 8
   Just
9. 9
   before
10. 10
    removing from heat, stir in butter and lemon extract. Pour
11. 11
    into
12. 12
    baked pie shell.
13. 13
    If desired, pie may be topped with whipped topping.