Lamb Meatballs in Spicy Eggplant Tomato Sauce

INGREDIENTS

• 1 eggplant, cubed
• 2 tablespoons olive oil
• salt and freshly ground black pepper to taste
• 1/3 cup finely minced onion
• 1 pinch crushed red pepper flakes, or to taste
• 1 1/2 cups chicken broth
• 1 cup marinara sauce
•  
• 1/4 cup plain dry bread crumbs
• 1 large egg
• 1 1/2 tablespoons Greek yogurt
• 1/4 cup finely minced onion
• 4 cloves garlic, finely minced
• 1 1/2 teaspoons kosher salt
• 1 teaspoon freshly ground black pepper
• 1 teaspoon ground cumin
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon ground coriander
• 1 pound ground lamb
• cayenne pepper to taste
• 1 tablespoon chopped fresh mint