Cream together sugar, butter and add vanilla & eggs 1 at a time. Add flour & salt. Mix together and add buttermilk.
Pour into crust and bake at 300 degrees for 90 minutes. Note: Watch crust. If browning too quickly put foil around edges to stop browning.
Crust: 3 cups flour, 3 T. Sugar, 1 tsp. salt, 1/4 tsp. baking powder, 1 1/4 c. shortening (crisco butter sticks work well), 1 egg, 5 T. cold water, 1 T. Vinegar. Mix together and press into a 9" pie tin. Scallop edges.