Intended as a sauce for the Sous Vide BBQ Brisket.
First, we need to make smoked coke. Pour the onions and the bottle of coke into a saucepan, and simmer on the stove on low heat to infuse the onion flavor into the coke, but don't burn too much of the sugars
Take the coke/onion mixture and pour it into a bowl and cover with plastic wrap.
Prepare your smoking gun with your favorite wood chips, and insert the tube of the gun underneath the plastic wrap. Feed smoke into the container and then cover with plastic wrap, let sit for 1-2 minutes.
Drain into another container using a mesh strainer, and now you've got a batch of smoked coke
Heat up a saucepan on medium heat. Add 1 Tbsp. of brisket fat to the pan and swirl to coat
Add the tomato paste and cook for a minute while stirring until the paste has darkened a bit
Add the cumin and pepper, cook for 30 seconds or so, then add the garlic and cook for another minute, stirring consistently
Add the remaining brisket drippings, ketchup, 1/4 cup of smoked coke, vinegar, Worcestershire sauce, brown sugar, and mustard. Stir to combine everything
Simmer the sauce on low heat for 30 minutes, keeping the pan covered to avoid getting sugary splatters all over your stove
Allow the sauce to cool, then stir in your vinegar sauce and adjust with salt or more sugar to achieve your desired flavor balance