Grilled Chicken Kebabs

Name: Grilled Chicken Kebabs
Ingredients: 2 pounds skinless, boneless chicken breasts, trimmed of any fat and cut into cubes; 1/2 cup extra-virgin olive oil; 3 tablespoons fresh lemon juice; 1 small onion, grated; 1/2 teaspoon freshly ground cinnamon; 1/2 teaspoon freshly ground cardamom seeds (from about 20 pods); 1 teaspoon dried or fresh thyme leaves; Salt and freshly ground black pepper; 1 teaspoon freshly ground cumin seeds, optional; 1 teaspoon Baharat, recipe follows; 1/2 teaspoon paprika; 1/4 cup black peppercorns; 1/4 cup allspice berries; 2 teaspoons ground cinnamon; 1 teaspoon freshly grated nutmeg