Sweet Potato Pie

INGREDIENTS

• :
• 1¼ cups unbleached all-purpose flour
• ½ teaspoon table salt
• 1 tablespoon granulated sugar
• 4 tablespoons unsalted butter, chilled, cut into 1/4-inch pieces
• 3 tablespoons vegetable shortening , chilled
• 4 - 5 tablespoons ice water
• 2 pounds sweet potatoes
• 2 tablespoons unsalted butter , softened
• 3 eggs
• 2 egg yolks
• 1 cup granulated sugar
• ½ teaspoon ground nutmeg
• ¼ teaspoon salt
• 2 tablespoons bourbon
• 1 tablespoon molasses
• 1 teaspoon vanilla extract
• 2/3 cup whole milk
• ¼ cup packed dark brown sugar