Begin by making the buttermilk pie crust. Mix together flour, sugar, and salt. Then, cut in the butter until it there are pieces ranging from pea-sized to whole cashew-sized.
Add most of the buttermilk and toss to combine. If the dough is still too wet add the rest of the buttermilk. Then, dump the dough out onto the counter and begin pressing it together.
Line the crust with parchment paper and fill with beans or pie weights. Bake for 15 minutes. Remove the parchment paper and beans and bake for abother 15 minutes or until browned and baked through.