To make the sauce, we need a medium-sized bowl. Chop the garlic, then peel and chop a 2-inch piece of ginger until you have 1 tablespoon. Add 1/2 cup apple juice, 1/4 cup soy sauce, 1/4 cup bourbon, 1/4 cup brown sugar, 3 tablespoons rice vinegar, and 1/4 teaspoon red pepper flakes. Beat the sauce until the sugar is completely dissolved.