Preheat oven to 375°F/190°C. Rinse chicken; pat dry. Place chicken on rack in large roasting pan. Stir oil and next 7 ingredients in small bowl to form paste. Rub spice paste all over chicken. Roast chicken 1 hour. Squeeze juice from lemon halves over chicken; place lemon halves inside main cavity. Continue to roast until chicken is cooked through and thermometer inserted into thickest part of thigh registers 175°F/80°C, about 1 hour longer. Transfer to platter; let rest 15 minutes.