Peggy's Buttermilk Pie

My friend Peggy Manning Meyer loves pies and loves to bake pies. This is her favorite recipe:

1 unbaked 9" pastry shell, chilled (Marie Callender makes a good frozen pie crust)
1 1/2 cups sugar
3 tablespoons flour
2 eggs, well beaten
1/2 cup butter, melted
1 cup buttermilk
2 teaspoons vanilla
1 teaspoon lemon extract

Preheat oven to 425.

Combine sugar and flour, then stir in eggs. Add melted butter and buttermilk. Mix well. Stir in vanilla and lemon extract. Pour into chilled pastry shell. Bake at 425 for 10 minutes, then reduce heat to 350 and bake for 35 additional minutes (do NOT open oven door while baking).