Biscuits and Gravy

Biscuits

• 1 oz salted butter, cut into pieces and frozen, plus extra to grease
• 9 oz all-purpose flour, plus extra to dust
• ¾ tsp fine sea salt
• ¼ tsp baking soda
• 4 tsp baking powder
• 1 oz vegetable shortening, cut into pieces and frozen
  or 1 oz lard, cut into pieces and frozen
• 7 ½ oz buttermilk, chilled
• 1 tsp bacon drippings, optional

Gravy

• 16 oz uncooked breakfast sausage, crumbled into pieces
  or 16 oz breakfast sausages, casings removed and crumbled into pieces
• 2 oz salted butter
• 2 oz all-purpose flour
• ½ tsp salt
• ½ tsp white pepper
• 18 oz whole milk