Burgers with Mozzarella and Spinach-Arugula Pesto
['8 ounces baby spinach leaves (about 10 cups packed)', '2 garlic cloves, peeled', '1/2 teaspoon (packed) finely grated lemon peel', 'Large pinch of dried crushed red pepper', '4 cups (packed) fresh arugula leaves, divided (about 5 ounces)', '3 tablespoons pine nuts', '1 teaspoon fresh lemon juice', '1/3 cup extra-virgin olive oil', '3 tablespoons (packed) freshly grated Parmesan cheese', '1 3/4 pounds ground beef (20% fat)', '1 teaspoon salt', '1/2 teaspoon ground black pepper', '6 hamburger buns, split horizontally', '6 1/3-inch-thick slices fresh mozzarella cheese', '2 large beefsteak tomatoes', 'cut into 1/4-inch-thick rounds']
Rinse spinach; drain briefly, then place in large glass bowl. Microwave spinach, uncovered, on high just until wilted, 1 to 1 1/2 minutes. Drain, then squeeze out as much liquid as possible. Combine garlic, lemon peel, and crushed red pepper in processor; blend until garlic is finely chopped. Add spinach, 2 cups (packed) arugula, pine nuts, and lemon juice; process until coarse puree forms. With machine running, gradually add oil in thin stream and blend until almost smooth. Mix in cheese. Transfer pesto to small bowl; season with salt.
Do ahead: Can be made 6 hours ahead. Cover; chill.
Combine ground beef, 1 teaspoon salt, 1/2 teaspoon black pepper, and 6 tablespoons spinach-arugula pesto in large bowl; mix lightly with fingertips or fork just until incorporated. Form meat mixture into six 3/4-inch-thick patties. Place patties on platter.
Do ahead: Beef patties can be made 6 hours ahead. Cover and refrigerate.
Prepare barbecue (medium-high heat). Grill burgers to desired doneness, about 4 minutes per side for medium-rare. Grill buns, cut side down, just until lightly toasted, about 1 minute. Build burgers with pesto, patties, mozzarella cheese, tomatoes, and arugula. Cover with bun tops.
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