Put the whole orange, thyme sprigs and bay leaf inside the cavity.
Rub the outside of the bird with olive oil, salt and pepper.
Put the birds in an oven bag with the onions, garlic, carrots and celery. Pierce a few wholes in the bag.
Place the oven bag on a rack in an oven tray with water at the bottom of it and roast 180C for 45min – 1 hour.
While the meat is resting make a gravy out of the juices in the bag
Sauce for roasted duck
Make a roux with butter and flour in a saucepan.
Strain the liquid from the bag into the saucepan.
Skim any excess fat off the top of the sauce with a ladle.
Whisk while cooking for a few minutes.
If too thick add more water. Adjust seasoning.
If you like the sauce to have more orange flavor then squeeze the juice and pulp of the cooked oranges from the duck cavity in to the sauce pot and mix.
Serve with roast potatoes and seasonal vegetables.
Notes
Roasting the duck in an oven bag traps moisture, steam, and aromas inside the bag, preventing the meat from drying out and keeping the meat juicy and tender.
Cooking time varies depending on size of the bird and type of oven you use. The recipes cooking time is an estimate only. Use a meat thermometer to check when the duck is ready.
Wild duck is best eaten pink. cook the bird until the duck reaches an internal temp of 135F or 58C