- 2 1/2 pounds ground sirloin beef
- 1 cup fresh or store-bought pesto, recipe follows
- 1/4 cup grated Parmesan
- 1 1/2 teaspoons kosher salt
- 1/2 teaspoon freshly ground black pepper
- One 7 to 8-ounce ball fresh mozzarella, sliced into eight 1/4-inch-thick slices, patted dry with paper towels
- Pesto Mayonnaise:
- 1/2 cup mayonnaise
- 1/4 cup fresh or store-bought pesto
- Extra-virgin olive oil for drizzling
- Eight 3-inch-square pieces of tomato or plain focaccia bread, halved, or 8 hamburger buns, halved
- 4 medium tomatoes, sliced into 1/4-inch-thick rounds (16 slices)
- 2 packed cups fresh basil leaves
- 1 cup grated Parmesan
- 1/4 cup pine nuts, toasted
- 1/2 teaspoon kosher salt
- 1/4 teaspoon freshly ground black pepper
- 2 cloves garlic, smashed
- 1/4 cup extra-virgin olive oil
Cook's Note: Freeze the mozzarella for 20 minutes to make slicing easier.
For the burgers: Place a grill pan over medium-high heat or preheat a gas or charcoal grill. Combine the beef, pesto, Parmesan, salt and pepper in a large bowl. Form the mixture into eight 4-inch-diameter patties, each about 3/4-inch thick. Grill for 5 minutes. Turn the burgers over and place a slice of mozzarella on top. Cook for about 5 minutes longer until the burgers are cooked through and the cheese is slightly melted. Allow the burgers to rest for 5 minutes.
To assemble the burgers: Drizzle the cut side of the bread with olive oil and grill until lightly toasted, 1 to 2 minutes. Spread the pesto mayonnaise over the bottom halves of the grilled bread. Place the burgers on top and add 2 tomato slices. Add the top halves of the bread and serve.Pesto:
Cook's Note: To toast the pine nuts, arrange in a single layer on a baking sheet. Bake in a preheated 350 degrees F oven until lightly toasted, 6 to 8 minutes. Cool completely before using.
Combine the basil, Parmesan, pine nuts, salt, pepper and garlic in a food processor. Pulse until finely chopped. With the machine running, gradually add the olive oil until the mixture forms a smooth paste. Yield: 1 1/4 cups.
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