This is one of the all time classic sauces and does not have to be confined to duck. Venison, Elk and game birds in general are all delicious accompanied by this exquisite sauce.
a L' Orange is a reduction sauce , of course the stock is an essential ingredient and when combined with a large volume of orange juice you better plan extra time for making this sauce.
The main ingredients are
60 ml or 1/4 cup of raw sugar
30 ml water
30 ml Dry Sherry or white vinegar
1
½ cups orange juice
1 1/2 cups chicken stock
Chopped shallots to taste
Orange rind
( Crisply fry small amounts of shallot and orange rind for garnish)
( This could take a couple of hours on low heat ) Then drop the butter in and allow it to melt completely before stirring it though with a wooden spoon.
Some chef's add slices of orange to the sauce late in the process so the slices are plump, hot and juicy but I feel that this takes away from the subject matter. The Duck! Some crispy garnish is enough as the dish speaks for it's self.
Now as far as cooking the duck goes. There are only two ways in my view. Quartered and cooked low and slow, covered in stock . Or Low and slow covered in Duck Fat.
Enjoy