Try this:

Soak in cold water over night

Next day, mix the following in a turkey roaster(amounts are according to taste and quantity needed):

White Rice
Cinnamon
Brown Sugar
Nutmeg (sparingly)
Raisins
Apple slices
Salt
Pepper
Water (enough to make a sticky clump out of the mixture)

Rinse and dry the ducks, stuff them with the above mixture. Place ducks in the turkey roaster with the remaining rice mixture surrounding them. Add more water (enough to ensure that the rice will cook properly). Dust the top of the ducks with additional cinnamon, brown sugar, salt and pepper. Bake at 350.