*For tender biscuits, keep ingredients cold and work as quickly as possible.
Preheat oven to 500ºF. Combine dry ingredients with whisk. Hand-toss butter and shortening into dry ingredients. Add buttermilk. Mix until dough begins to form. Dump dough onto floured work surface and pat into rough rectangle about 3/4-inch thick. Fold dough into thirds, flatten with hands, and fold again. Cut biscuits from dough using two-inch round cutter. Arrange biscuits so they almost touch on ungreased cookie sheet. Bake for 13 to 18 minutes or until biscuits have risen and tops are light brown.
