Creamy Spinach Artichoke Orzotto

Name: Creamy Spinach Artichoke Orzotto
Ingredients: 3 cups low-sodium vegetable or chicken broth; 2 ounces Parmesan cheese, finely grated (about 1 firmly packed cup grated on a Microplane or 2/3 cup store-bought); 1 medium shallot; 1 small lemon; 2 tablespoons olive oil; 1 1/2 cups dried orzo pasta (10 ounces); 1/2 teaspoon kosher salt, plus more as needed; 1/4 teaspoon freshly ground black pepper; 1/2 cup dry white wine; 1 (12-ounce) bag frozen artichoke hearts; 5 ounces baby spinach (about 5 packed cups); 1 tablespoon unsalted butter