Melt butter in a heavy saucepan over medium heat. Add onion, ginger, and garlic; sauté 3 minutes or until tender.
Stir in reserved cola; bring mixture to a boil. Stir in ketchup and remaining ingredients; bring to a boil. Reduce heat, and simmer 5 minutes.
Note: For testing purposes only, we used A1 Steak Sauce.