Jemima's Sweet Potato Pie

Ingredients:
4 medium sweet potatoes, cooked, peeled, & mashed
1/4 cup flour
1 can evaporated milk
2 eggs
1/2 cup white sugar
1/4 cup brown sugar
1 tablespoon lemon juice
1 tablespoon allspice
1 stick of butter
1 pie shell
Directions:
Preheat oven to 300 degrees. Combine all ingredients and stir. Pour into pie shell and bake 1 hour.