Chef John's Scones

Details

Ingredients

• 1 ¾ cups all-purpose flour
• ¼ cup white sugar
• 4 teaspoons baking powder
• ⅛ teaspoon salt
• 5 tablespoons unsalted butter
• ½ cup milk
• ¼ cup sour cream
• ⅓ cup dried currants
• 1 egg, lightly beaten
• 1 tablespoon milk