Spicy Lamb Burgers with Grilled Eggplant

Name: Spicy Lamb Burgers with Grilled Eggplant
Ingredients: 3 pounds ground lamb shoulder; 1 small onion, grated; ½ cup chopped parsley; 2 tablespoons finely chopped mint; 2 teaspoons finely chopped marjoram; 6 garlic cloves, smashed to a paste with a little salt; 2 teaspoons cumin seeds, toasted and ground; 2 teaspoons coriander seeds, toasted and ground; 1 teaspoon ground cinnamon; 2 teaspoons salt; 1 teaspoon pepper; ½ teaspoon cayenne; ½ teaspoon red pepper flakes; 3 large eggplants, sliced into ½-inch-thick circles; 2 tablespoons olive oil; Salt; Freshly ground pepper