Vinegar Pie

Directions

1. 1
   Combine sugar, water and vinegar in a saucepan; bring to the boil.
2. 2
   Add butter and stir until it melts.
3. 3
   Mix flour with a little cold water to make a smooth paste.
4. 4
   Add to boiling liquid slowly and stir until thickened.
5. 5
   Line a pie pan with pastry, pour in filling and cover with strips of pastry, lattice fashion.
6. 6
   Bake at 450F for ten minutes; reduce heat to 350F and bake for an additional 25 minutes.