Duck with Blueberry Sauce

2 Ducks, whole
Salt and pepper

SAUCE:
1 tb Butter
5 tb Sugar
2/3 c Wine vinegar
Juice of 4 oranges
1/3 c Chicken stock
1/4 c Blueberries
1 tb Cognac

Season ducks with salt and pepper and roast at 500F for 30 minutes. Reduce heat to 350F and roast 60-75 minutes, or until ducks are tender. Baste two or three times with pan drippings. Cool ducks 20 minutes then carve and arrange on a warm platter.

Heat butter and sugar until caramelized. Add vinegar, juice from the oranges and the stock. Stir until caramel is dissolved, then boil until reduced to a syrup. Add blueberries and cognac and spoon sauce over duck.