Make your Sunday serve a Sour. "Maple Bourbon Sour" - 2 oz WhistlePig PiggyBack 100 Proof Bourbon - 3⁄4 oz WhistlePig Barrel Aged Maple Syrup - 1 oz freshly squeezed lemon juice - 2 dashes of bitters - 1 egg white (*optional) - Fresh orange peel or cherry for garnish