Ok I've withheld this info for a bit, but here it is. In Coerthas in the Southern most town, the observatorium there is a levequest called "Necrologos: Cinerary rites" It will have you kill 5 black sheep and afterwards it will spawn a white pudding monster. This pudding has the chance to drop the pudding flesh. I have yet to get a HQ version of it but im sure it can drop from the monster. You only get to kill one pudding per levequest so you might have to redo it a few times if you are unlucky. I would attach a screenshot but I do not know how to find the photos I take from in game.