Brisket Sliders

Ingredients (19)

• 2 tablespoons plus 1/8 teaspoon salt, divided
• 2 tablespoons sugar
• 2 tablespoons whole peppercorns, crushed
• 5 garlic cloves, minced
• 1 fresh beef brisket (about 4 pounds)
• 1 cup mayonnaise
• 1/2 cup crumbled blue cheese
• 2 teaspoons horseradish
• 1/8 teaspoon cayenne pepper
• 3 medium carrots, cut into 1-inch pieces
• 2 medium onions, chopped
• 2 celery ribs, chopped
• 1 cup dry red wine or beef broth
• 1/4 cup stone-ground mustard
• 3 bay leaves
• 1 tablespoon olive oil
• 3 medium onions, sliced
• 24 mini buns
• Optional: Arugula and tomato slices