Spiced Harissa Beef and Lamb Koftas

Name: Spiced Harissa Beef-and-Lamb Koftas
Ingredients: 1 pound 85% lean ground beef chuc; 8 ounces ground lamb; 1 egg, lightly beaten; 1/3 cup finely chopped fresh cilantro; 1/4 cup grated onion; 2 tablespoons harissa paste (see tip, right); 2 cloves garlic, minced; 2 teaspoons ground coriander; 1 teaspoon salt; 1 teaspoon cumin; 1 teaspoon ground turmeric; 1/2 teaspoon ground ginger; 1/4 teaspoon ground cinnamon; 1/2 cup plain yogurt; 1 1/2 tablespoons tahini (sesame seed paste); 1 tablespoon lemon juice; 1 1/2 teaspoons finely chopped fresh parsley; 1/8 teaspoon salt