Preheat oven to 425 degrees F. Prepare pie pastry.
In a large bowl, combine sugar, flour, and 1/2 cup buttermilk. Add beaten eggs and the remaining 1/2 cup buttermilk; mix well with a whisk.
Mix in the melted butter and vanilla extract.
Pour into prepared pie crust. Sprinkle chopped pecans over the top.
Bake for 10 minutes, then reduce heat to 350 degrees F. and bake approximately 25 to 30 minutes or until the internal temperature registers at least 160 degrees F. on your cooking thermometer and the top is lightly brown and the center is set.
Remove from oven and let cool on a wire rack. Refrigerate after cooling.
Makes 1 delicious pie.
Old Fashioned Buttermilk Pie Recipe: https://whatscookingamerica.net/buttermilkpie.htm