Preheat your smoker to 225°F using oak or hickory wood for an authentic Texas profile.
Combine the sea salt, black pepper, garlic powder, and onion powder in a small bowl to create the dry rub.
Season the beef brisket evenly on all sides with the spice mixture, pressing it firmly into the meat to ensure a good crust.
Place the brisket in the smoker and cook until the internal temperature reaches 165°F.
In a small saucepan, whisk together the tomato paste, two tablespoons of the apple cider vinegar, smoked paprika, and monk fruit sweetener over low heat to create the glaze.
Brush the glaze over the brisket, wrap it tightly in butcher paper, and return it to the smoker.
Continue smoking until the internal temperature reaches 203°F and the meat is tender enough to pull apart easily.
Allow the brisket to rest for at least 30 minutes before slicing thinly against the grain to maintain juiciness.
Toss the shredded cabbage with the remaining tablespoon of apple cider vinegar and the avocado oil to serve as a fresh, crunchy side.