Lamb Meatballs with Spinach and Orzo

Name: Lamb Meatballs with Spinach and Orzo
Ingredients: 1 1/2 pounds ground lamb; 9 ounces frozen spinach, thawed and squeezed dry; 1/2 medium red onion, finely chopped (about 1 cup); 1/2 cup feta cheese, plus more for topping; 1 egg, beaten; 1/2 cup Italian-style bread crumbs; 2 cloves garlic, very finely chopped; 1 teaspoon grated lemon zest; 3 tablespoons extra virgin olive oil; 1 teaspoon kosher salt; 1 teaspoon ground black pepper; 1 1/2 cups orzo; 3 cups low-sodium chicken broth; 2 tablespoons chopped fresh mint