Preparation Whisk yogurt, lemon juice and peel in small bowl until smooth. Add mint, garlic, salt, cinnamon, cayenne and allspice. (Can be made 1 day ahead. Cover; chill.) Marinate lamb or chicken in half of marinade at least 1 hour or up to 4 hours in refrigerator. Remove from marinade, leaving thin coating of marinade on lamb or chicken. Grill. Passing remaining half of marinade separately.
Preparation Whisk yogurt, lemon juice and peel in small bowl until smooth. Add mint, garlic, salt, cinnamon, cayenne and allspice. (Can be made 1 day ahead. Cover; chill.) Marinate lamb or chicken in half of marinade at least 1 hour or up to 4 hours in refrigerator. Remove from marinade, leaving thin coating of marinade on lamb or chicken. Grill. Passing remaining half of marinade separately.