Roast ducks at 325 degrees F for about 3 hours, basting often.
Pour off and reserve excess dressings.
Heat orange juice, brown sugar, orange rind and drippings in saucepan. Add
flour and cook slowly until sauce thickens. Pour sauce over ducks and return
them to the oven. Continue basting ducks while cooking, about 1 hour more.
When done, add Cointreau to sauce in pan and serve.