Plum Sauce Published July 31, 2013 at 480 × 640 in Plum Sauce Plum Sauce by Lee Kum Kee Plum sauce by Lee Kum Kee. For Roast duck pancakes, combine 1 part plum sauce to 3 parts hoisin sauce. Dab about 1/2 teaspoon of this onto the pancake before adding slivers of roast duck meat and skin and fresh herbs.