01 - Pat the brisket thoroughly dry with paper towels. Season generously with salt and freshly ground black pepper on all sides.
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 completely smooth and sugar is dissolved.
03 - Place the seasoned brisket into the slow cooker. Pour the BBQ sauce mixture evenly over the meat, turning to coat all surfaces.
04 - Cover and cook on LOW setting for 8 hours. The brisket is done when it shreds easily with a fork and reaches internal temperature of 205°F.
05 - Carefully remove the brisket from the slow cooker and transfer to a cutting board. Let rest for 10 minutes to allow juices to redistribute.
06 - Pour the cooking liquid from the slow cooker into a saucepan. Simmer over medium-high heat for 10 to 15 minutes, stirring occasionally, until reduced and thickened to desired consistency.
07 - Slice the brisket thinly against the grain or shred with two forks. Return the meat to the slow cooker and toss with the thickened sauce. Garnish with chopped fresh herbs and serve with rolls or mashed potatoes.