01 - Pat the brisket completely dry with paper towels. Season generously with salt and pepper on all sides, pressing the seasoning into the meat.
02 - In a medium bowl, whisk together tomato passata, apple cider vinegar, brown sugar, Worcestershire sauce, Dijon mustard, smoked paprika, garlic powder, onion powder, black pepper, salt, and cayenne pepper until the sugar dissolves completely.
03 - Place the seasoned brisket into the slow cooker, fat side up. Pour the prepared BBQ sauce over the meat, using a brush or spoon to coat all surfaces evenly.
04 - Cover and cook on LOW setting for 8 hours. The brisket is done when it reaches an internal temperature of 205°F and shreds easily with a fork.
05 - Transfer the brisket to a cutting board and let rest for 10 minutes. This allows the juices to redistribute throughout the meat.
06 - Pour the cooking liquid from the slow cooker into a saucepan. Simmer over medium-high heat for 10–15 minutes, stirring occasionally, until reduced and thickened to a glaze consistency.
07 - Slice the brisket against the grain into thin strips, or shred with two forks. Return the meat to the slow cooker and toss with the thickened sauce. Garnish with fresh herbs and serve with rolls or mashed potatoes.