Brown the beef brisket on all sides in a skillet placed over high heat and place in the slow cooker.
2 lbs. beef brisket
Cook the onion for one or two minutes over medium heat in the same skillet.
2 cups onion
Add all the remaining ingredients to the skillet, mix well, and heat up.
2 tbsp. tomato paste, ¾ cup beef stock, ½ cup honey, 2 tbsp. Dijon mustard, ½ cup ketchup, 2 tbsp. balsamic vinegar, 2 tbsp. Worcestershire sauce, 1 tsp. liquid smoke, Sea salt and freshly ground black pepper
Drizzle the sauce over the brisket and cook on low for 8 hours.
Remove the brisket from the slow cooker. Pull the meat apart or slice it against the grain. Don’t throw away the sauce left in the slow cooker.
Pour the remaining sauce into a saucepan and cook until the sauce thickens up.
Serve the meat with hot sauce.