Italian Burgers

• 4 slices red onion, about 1/4 in. thick
• 2 tablespoons balsamic vinegar
• 1/4 cup olive oil, divided
• 3/4 cup chopped giardiniera*
• 1/3 cup mayonnaise
• 1 tablespoon chopped fresh oregano leaves
• 1 1/2 pounds ground lean beef
• 1 teaspoon kosher salt
• 1/2 teaspoon pepper
• 4 ciabatta or focaccia buns, split
• 4 slices provolone cheese
• About 2 cups lightly packed arugula

1. Heat grill to medium (350u0b0 to 450u0b0). Put onion in a small bowl and toss with vinegar and 1 tbsp. oil; set aside. Mix giardiniera with mayonnaise and oregano; set aside.
2. 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). Brush patties lightly on both sides with 1 tbsp. oil. Brush cut sides of buns with remaining 2 tbsp. oil.
3. 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.
4. Assemble burgers, topping them with onion, arugula, and a hefty dollop of mayonnaise mixture.
5. *Find giardiniera in the pickle aisle of well-stocked grocery stores.

red onion, balsamic vinegar, olive oil, chopped giardiniera, mayonnaise, oregano, ground lean beef, kosher salt, pepper, buns, provolone cheese, arugula

Taken from www.myrecipes.com/recipe/italian-burgers (may not work)