Bite into this mild-mannered-looking burger and you’ll get a cheesy surprise and the big flavors of garlicky arugula pesto. My burgers come off the same grill that has been at the Rock since it first opened 70 years ago (it was the only piece of the kitchen that was unharmed from the fire), and it has probably grilled about 21⁄2 million burgers since then. I mean, off of that grill came burgers to feed our boys going off to World War II and coming home from ‘Nam. It served the hungry during the Depression. When I think of all the people who have been comforted by the food coming off of that grill, it gives me perspective and makes me happy that I can keep the Rock and its amazing history alive.

Pesto
1 cup (about 4 ounces) finely grated Parmesan cheese
About 2 cups arugula
1⁄2 cup toasted pine nuts
1⁄4 cup extra-virgin olive oil
4 garlic cloves, roughly chopped
1⁄2 teaspoon freshly ground black pepper
1⁄4–1⁄2 teaspoon salt
Burgers
1⁄2 recipe meatball mixture (about 21⁄2 pounds)
6 slices fresh mozzarella cheese
2 teaspoons canola oil
6 hamburger buns, toasted
Make the pesto. Place the Parmesan, arugula, pine nuts, olive oil, garlic, and pepper in a food processor and blend for 15 seconds. Stop and scrape the sides of the bowl, and process until the pesto is smooth, about 10 seconds more. Taste and add the salt if necessary.
Stuff the burgers. Take 1⁄3 cup meat mixture and form it into a flat circle, about 4″ in diameter. (Make the patty slightly larger or smaller depending on the width of your mozzarella cheese slice—the patty should be just slightly wider than the cheese slice.) Place a piece of cheese in the center and top with another 1⁄3 cup meat mixture, also flattened into a circle. Seal the edges shut and repeat with the remaining meat and cheese, until you have 6 filled hamburger patties.
Cook the burgers. Heat the canola oil in a large, nonstick skillet over medium-high heat. Place the burgers in the pan (as many as will fit), cover, and cook until browned, about 3 to 6 minutes per side. Place each burger on the bottom half of a bun, top the burger with about 2 tablespoons pesto, cover with the bun top, and serve.



















