Preheat oven to 450 degrees F.
Cut into small pieces and place into the freezer on a small plate to chill
6 tbsp. butter
2 tbsp. shortening.
Mix together and set aside to curdle
1 cup milk
1 tbsp. white vinegar (or lemon juice).
Whisk (or sift) together
2 cups all purpose flour
1 tbsp. baking powder
1 tsp. sugar
1/2 tsp. kosher salt.
Cut the chilled fats into the flour mixture, then stir in curdled milk until a loose shaggy dough forms. Turn out onto a floured surface and need a few times (the business letter fold is useful here). Pat out in 1.5″ disc, then cut with a biscuit cutter.
Baked 15-20 minutes. When biscuits are done, paint with 2 tbsp. melted butter, and return to the oven under the broiler until tops are golden.