Short Rib Sandwich - Traeger Grills

Ingredients

• 2 1/2 Pound beef short ribs
• As Needed Traeger Prime Rib Rub
• 2 Tablespoon olive oil
• 1 onion, diced
• 2 Large carrots, peeled and diced into 1/2 inch pieces
• 2 Stalk celery, diced
• 2 Clove garlic
• 1 Cup red wine
• 1 Cup beef stock
• 3 Tablespoon balsamic vinegar
• 2 dried bay leaves
• 3 Sprig thyme sprigs
• 1 Sprig rosemary sprigs
• 2 Tablespoon butter
• 2 Yellow onion, thinly sliced
• 1 Tablespoon sherry vinegar
• To Taste Salt
• To Taste black pepper
• ciabatta buns, for serving
• Slices provolone cheese
• As Needed mayonnaise
• As Needed Mustard