01 - Pat the brisket dry with paper towels and season lightly with salt and pepper.
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 well combined.
03 - Place the brisket into the slow cooker. Pour the BBQ sauce over the meat, ensuring it is well coated.
04 - Cover and cook on LOW for 8 hours, or until the beef is very tender and shreds easily with a fork.
05 - Remove the brisket from the slow cooker and let rest for 10 minutes.
06 - Pour the cooking liquid into a saucepan and simmer over medium-high heat for 10–15 minutes to thicken, stirring occasionally.
07 - Slice or shred the brisket against the grain. Return to slow cooker and toss with thickened sauce. Garnish with chopped fresh herbs and serve with rolls or mashed potatoes.