Moroccan Beef Meatball Tagine

Name: Moroccan Beef Meatball Tagine
Ingredients: 1 1/2 pounds ground beef (20% fat); 1/3 cup coarsely grated onion; 1/3 cup panko (Japanese breadcrumbs); 1/4 cup chopped fresh cilantro; 1 large egg, beaten to blend; 2 garlic cloves, minced; 1 teaspoon turmeric; 1/2 teaspoon cayenne pepper; 1/2 teaspoon ground cinnamon; 1/2 teaspoon ground nutmeg; 1/2 teaspoon freshly ground black pepper; 1/2 teaspoon coarse kosher salt; 1/4 teaspoon ground ginger; 1 tablespoon olive oil; 3 1/2 cups chopped onions; 4 garlic cloves, minced; 2 cinnamon sticks; 1/8 teaspoon saffron threads, crumbled; 2 cups beef broth; 1 14.5-ounce can diced tomatoes in juice; 1/4 cup golden raisins; 2 cups 1/2-inch-thick carrot slices (cut on diagonal); 1/4 cup chopped fresh cilantro plus additional for garnish; 1 5-ounce package baby spinach leaves; Couscous with Fresh Cilantro and Lemon Juice (click for recipe); Lemon wedges (for garnish)