Spring Green Orzotto

Name: Spring Green Orzotto
Ingredients: Kosher salt; One 5-ounce container baby spinach; 1 1/2 cups lightly packed fresh basil leaves; 2 cups frozen peas; 1/2 cup lightly packed fresh parsley leaves; 1/4 cup lightly packed fresh mint leaves; 1 teaspoon finely grated lemon zest plus 2 tablespoons lemon juice, plus more zest for serving; 3 tablespoons olive oil; 1 clove garlic, finely chopped; 1 large shallot, finely chopped; Freshly ground black pepper; 1 pound orzo; 6 cups low-sodium chicken or vegetable broth, warmed; 2 tablespoons freshly grated Parmesan, plus more for serving; 2 tablespoons freshly grated Pecorino Romano