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Ingredients

• 2 tablespoons  extra-virgin olive oil; more as needed
• 1 large  sweet onion, thinly sliced (about 2 cups)
•   Kosher salt and freshly ground black pepper
• 1/3 cup  mayonnaise
• 1 tablespoon  Dijon mustard
• 1-1/2 teaspoons  fresh lemon juice
• 1 teaspoon  finely chopped fresh rosemary
• 1 small  clove garlic, minced
• 1-1/2 pounds  85%-lean ground beef
• 4   slices Comte or Gruyere cheese
• 4   good-quality hamburger buns or rolls, split
• 12   fresh arugula leaves

Description

Burgers Just Got Better With The Addition Of Tender Sweet Onions, Melted Cheese, And Tangy Lemon-Dijon Mayonnaise.

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