3 spinach nut burger Recipes

baby spinach leaves (about 10 cups packed), garlic cloves, peeled, grated lemon peel, dried crushed red pepper, fresh arugula leaves, divided (about 5 oz), pine nuts, fresh lemon juice, extra-virgin olive oil, freshly grated parmesan cheese, ground beef (20% fat), salt, ground black pepper, hamburger buns , split horizontally, thick slices fresh mozzarella cheese, beefsteak tomatoes, cut into 1/4-inch-thick rounds

fat-free mayonnaise, lemon juice, garlic clove, minced, dried oregano, salt, frozen chopped spinach, thawed and squeezed dry, crumbled reduced-fat feta cheese, lemon juice, pine nuts, finely chopped, garlic clove, minced, dried oregano, salt, pepper, ground beef, hamburger buns, split