Buttermilk Scones

Ingredients

• 3/4 cup zante dried currant
• 4 3/4 cups all-purpose flour
• 1 tablespoon baking powder
• 3/4 teaspoon baking soda
• 1/2 cup granulated sugar
• 1 1/4 teaspoons salt
• 1 cup unsalted butter, very cold plus
• 1 tablespoon unsalted butter, very cold
• 1 1/2 cups buttermilk
• 1 teaspoon grated lemon zest
• Topping
• 3 tablespoons unsalted butter, melted
• 1 large sugar crystals