1 (3 pound) whole chicken, rinsed
salt and pepper to taste
1 small onion, quartered
¼ cup chopped fresh rosemary
Roast in the preheated oven until chicken is no longer pink in the center and the juices run clear, 2 to 2 1/2 hours. An instant-read thermometer inserted into the center of chicken near the bone should read at least 165 degrees F (74 degrees C).