Purple red is a kind of moon cake, and moss is one of the fillings. Usually, sugar, sesame oil and flour are put into a basin in turn and stirred evenly, and then peach kernel, melon seed kernel, sweet-scented osmanthus, moss, HongLing and crystal sugar are added and stirred evenly to form stuffing. This kind of "green silk" is generally orange peel, which is a traditional raw material for flood, and is often used as a part of stuffing.
The above information is for reference only, or you can consult a professional cake maker for more information.