Pat ducks dry with paper towels. Combine flour with next 5 ingredients and season ducks with flour. Heat enough oil to submerge ducks completely. When oil is hot, about 375 degrees, but not smoking, add ducks, one at a time. Allow a few minutes between ducks so that oil can maintain temperature. Turn ducks over 1 or 2 times and remove after 8 minutes. To prepare sauce, heat plum preserves and applesauce in a small pan. In a separate bowl, whisk together remaining ingredients and then add to pan. Heat until it starts to thicken. Serve plum sauce on the side for dipping with ducks.