Roast Beef Sandwich with Caramelized Onions | Levitts

Ingredients

• 2 tsp (10 ml) olive oil
• 1 tsp (5 g) butter
• 1 large onion, sliced into ⅛- to ¼-inch thick slices
• ¼ tsp (2 g) salt
• 1 pkg (150 g) Levitts Seasoned Roast Beef Thinly Sliced
• 1 tbsp (15 ml) mayonnaise
• 1 6- to 8-inch French roll, partially sliced lengthwise (not all the way through)
• 2 slices Provolone cheese
• Au jus (optional)