Combine all glaze ingredients in a medium-sized saucepan. Bring to a boil over medium heat, reduce heat to a simmer and cook, stirring often, 20-30 minutes, or until glaze is the consistency of syrup. Remove from heat and set aside.
1 cup dark brown sugar, 12 ounces cola, 2 tablespoons apple cider vinegar, 1 tablespoon low-sodium soy sauce, 1½ tablespoons Dijon mustard, 1½ tablespoons grainy mustard, 1 teaspoon ground ginger, ½ teaspoon onion powder, ¼ teaspoon crushed red pepper flakes, ¼ teaspoon kosher salt