HOW TO MAKE BUTTERMILK PIE

HOW TO MAKE BUTTERMILK PIE
Ingredients:
1 3/4 cups sugar
1 stick unsalted butter (1/2 cup), room temperature
3 large eggs
1/4 tsp vanilla extract
Pinch of salt
3 tbsp all-purpose flour
1 cup buttermilk
1 9-inch pie shell, unbaked