Accidental Chicken

With a mortar and pestle crush together zest, garlic, and coriander seeds. Add remaining spice rub ingredients and pepper to taste and crush to form a paste. Put chicken pieces in a bowl or large sealable container and coat with spice rub. Marinate chicken, covered and chilled, at least 2 hours and up to 1 day. Preheat oven to 400 °F and bring chicken to room temperature. Halve onion and cut into 1/4-inch-thick slices. Halve eggplant lengthwise and cut into 1/4-inch-thick slices. Peel and quarter turnip. Cut turnip into 1/4-inch-thick slices. Crush garlic with flat side of a large knife and peel potatoes. Halve potatoes and cut into 1/4-inch-thick slices. In a large roasting pan toss vegetables with oil, rosemary, and salt and pepper to taste and spread in one layer. Top vegetables with chicken, skin sides up, and roast in middle of oven 50 to 60 minutes, or until cooked through.