Italian Burgers

Ingredients

• 2 cups lightly arugula packed
• 2 tablespoons balsamic vinegar 
• 4  focaccia buns split
• 0.8 cup giardiniera chopped
• 1 teaspoon kosher salt 
• 1.5 pounds ground beef lean
• 0.3 cup mayonnaise 
• 0.3 cup olive oil divided
• 1 tablespoon oregano leaves fresh chopped
• 0.5 teaspoon pepper 
• 4 slices provolone cheese 
• 4 slices onion red thick

Equipment

• bowl
• grill

Directions

1. Heat grill to medium (350 to 450). Put onion in a small bowl and toss with vinegar and 1 tbsp. oil; set aside.
2. Mix giardiniera with mayonnaise and oregano; set aside.
3. Season beef with salt and pepper, mixing with your hands until just combined. Divide into 4 portions and form into patties. Using your thumb, press a dent into the center of each patty (it will even out as the burger cooks).
4. Brush patties lightly on both sides with 1 tbsp. oil.
5. Brush cut sides of buns with remaining 2 tbsp. oil.
6. Drain onion and discard marinade. Grill onion and burgers until onion is softened and charred slightly, about 5 minutes, and until burgers are done the way you like, about 8 minutes for medium-rare. In the last 2 to 3 minutes of cooking, top burgers with cheese and lightly toast buns.
7. Assemble burgers, topping them with onion, arugula, and a hefty dollop of mayonnaise mixture.
8. *Find giardiniera in the pickle aisle of well-stocked grocery stores.