Whipped Buttercream Frosting

• ¼ cup unbleached (all-purpose) flour
• 1 cup whole milk
• ½ pound

Combine the flour and ¼ cup of the milk in a small heavy saucepan and whisk until blended. Set the pan over medium heat and gradually add the remaining ¾ cup milk, whisking constantly, then cook, whisking, unt