Brisket Sliders with Caramelized Onions

Directions

1. In a small bowl, combine 2 tablespoons salt, sugar, peppercorns and garlic; rub onto all sides of brisket. Cover and refrigerate 8 hours or overnight. In a small bowl, combine mayonnaise, blue cheese, horseradish and cayenne. Refrigerate until assembling.
2. Place carrots, chopped onions and celery in a 6- or 7-qt. slow cooker. Place brisket on top of vegetables. In a small bowl, combine red wine, mustard and bay leaves; pour over brisket. Cook, covered, on low 7-9 hours or until meat is fork-tender.
3. Meanwhile, in a large skillet, heat oil over medium heat. Add sliced onions and remaining salt; cook and stir until softened. Reduce heat to medium-low; cook 30-35 minutes or until deep golden brown, stirring occasionally.
4. Remove brisket; cool slightly. Reserve 1 cup cooking juices; discard remaining juices. Skim fat from reserved juices. Thinly slice brisket across the grain; return to slow cooker. Pour juices over brisket.
5. Serve brisket on buns with mayonnaise mixture and caramelized onions and, if desired, arugula and tomato slices.