Old Time Vinegar Pie

Directions

1. 1
   Mix flour with half the sugar and add boiling water.
2. 2
   Cook in double boiler for 15 minutes, stirring often.
3. 3
   Add rest of sugar and beaten egg yolks; cook a few minutes longer.
4. 4
   Add butter and vinegar.
5. 5
   Flavor with lemon extract (if desired) and cool.
6. 6
   Pour into baked shell and meringue.