Old South Buttermilk Pie By Mildred Travis OH this pie is great!!! Simple pie too! Ingredients 1/3 c butter; softened 1 1/2 c sugar 2/3 c buttermilk 1 pn salt 2 tb flour 2 eggs; beaten 1 ts vanilla extract Instructions Cream butter and sugar. Add buttermilk, salt, flour, eggs, and vanilla. Pour into unbaked pie shell. Bake about 1 hour at 300 degrees F. Pie is done when knife inserted in center comes out clean