Amaranth in Brodo with Egg and Spinach

Name: Amaranth in Brodo with Egg and Spinach
Ingredients: 8 whole chicken legs (4 1/2 pounds); 1 pound beef stew meat, cut into 1-inch pieces; 2 turkey wings; 1 onion, chopped; 4 celery ribs, chopped; 2 carrots, chopped; One 12-ounce can whole tomatoes; 1 teaspoon black peppercorns; 12 parsley sprigs, plus 1 tablespoon chopped parsley; 1/2 cup amaranth; 4 cups baby spinach (4 ounces); 3 large eggs; 2 tablespoons freshly grated Parmigiano-Reggiano, plus more for garnish; Pinch of grated nutmeg; Fine sea salt; Pepper