Ingredients 1 and 3/4 cups buttermilk* 1 large egg (optional, see note) 4 and 1/4 cups all-purpose flour (spoon & leveled), plus more for your hands and counter 3 Tablespoons granulated sugar 1 teaspoon baking soda 1 teaspoon salt 5 Tablespoons unsalted butter, cold and cubed* optional: 1 cup raisins Preheat oven to 400F, lower if you use a convection oven. Use a seasoned 10–12-inch…