1 1/4 cups sugar
1/2 stick (1/4 cup) melted butter
3 large eggs, beaten
1 tablespoon all-purpose flour
1/2 cup buttermilk
1 teaspoon vanilla
1 unbaked 9-inch deep-dish pie crust

Preheat oven to 350 degrees. Mix sugar, butter, eggs and flour well.
Stir in buttermilk and vanilla. Pour filling into crust. Bake for 12 minutes; reduce heat to 325 degrees and continue baking for an hour.