Heat olive oil in skillet over medium temp. Saute onions until soft.
Gently blend ketchup, liquid smoke, garlic granules and Worcestershire Sauce together in the skillet.
Slowly add in the Dr. Pepper while stirring. Bring to a boil, then turn heat down to low. Stir until sauce begins to thicken slightly or to your desired thickness. (If you are short on time or want your sauce thicker add in 1 T of cornstarch and whisk. Continue until you reach your desired thickness!)
ENJOY!
Notes
I used regular Dr. Pepper. But diet or Dr. Zevia would also work.
Add cornstarch. This can help thicken the sauce, and works great if your're short on time.
Check those labels. Worcestershire sauce is traditionally NOT vegan. Be sure to read your labels if you are vegetarian/vegan. Also, please note that you need to make sure its gluten-free. I use THIS ONE, it is vegan and gluten-free.