Roast Chicken with Citrus & Thyme

To roast the chicken: Place oven rack at the lowest position. Preheat oven to 425 degrees F.

Cut 1 orange half and 1 lemon half into wedges. Squeeze the juice from the remaining halves into a small bowl and set aside. Remove any excess fat from chicken. Rinse the chicken with cold water and pat dry. Season the cavity with salt and pepper and stuff it with the orange wedges, lemon wedges, 4 pieces of garlic and 2 thyme sprigs. Tie the legs together with butcher's twine and tuck the wing tips under the back.

Working from the edge of the cavity, gently lift the skin covering the breast, taking care not to tear it, and place a thyme sprig between the flesh and the skin on either side of the breastbone.

Scatter onions, carrots, the remaining garlic cloves and thyme sprigs in the bottom of a roasting pan. Chop giblets and add to the pan; place neck in pan as well.

Set the chicken on the vegetable mixture in the roasting pan and season with salt and pepper. Roast the chicken for 20 minutes.

Lower the oven temperature to 325 degrees and continue roasting, basting occasionally with the reserved citrus juice, until an instant-read thermometer inserted into the thickest part of the thigh registers 180 degrees F, about 1 1/2 hours longer. Tip the chicken and let the juices run into the roasting pan. Transfer the chicken to a platter and tent with foil to keep warm.

To make the gravy: Place the roasting pan on the stove. Add wine and bring to a boil over high heat. Cook, stirring constantly, for 5 minutes, scraping up any brown bits clinging to the bottom of the pan. Add broth and simmer for 5 minutes more. Strain the mixture through a fine sieve into a bowl. Let stand for 5 minutes to allow the fat to rise to the surface. Using a bulb baster, transfer the juices to a saucepan (leaving the fat behind) and bring to a boil over medium heat. Add mustard and the dissolved cornstarch; whisk until thickened. Season with salt and pepper.

Remove the twine from the chicken and carve, discarding the skin. Serve with the gravy.