I've searched the internet far and wide, and I've found no answer to this question:
Where / how do I obtain Pudding Flesh?

On Moogle, there's been a total of 10 Pudding Flesh on the Market over the course of the server's lifespan. I do not recall seeing any Puddings outside of the few dungeons they're actually present in. And from what I can tell, the Prison Puddings in Toto-rak, the pudding boss in Wanderer's Palace and the Puddings from levequests do NOT drop these Pudding Flesh.
They're used for the Mega-potion of Vitality recipe, of which we need a single HQ (along with other potions) to complete our level 45 ALC quest.

If someone knows where / how I can obtain this Pudding Flesh, that'd be great - if not, I'll just leave the post here for SE to read and hopefully, correct