This is rare indeed! The plant they call preacher's porridge. See the pods, containing some thick, lumpy substance? I've only ever read about this. Its properties have never been classified, but they're rumoured to be dangerous. Collect a sample, but be careful how you use it!"
-- Zygmunt Budge (BoP)
A magical plant with pods that secrete a lumpy blue substance.
Rumored to be dangerous, but used in preparation of the Potion of All Potential (BoP)
Spelling confirmed by Harry Potter Wiki from Book of Potions Game Files.
Possibly a British colloquial pronunciation of "Preacher's Porridge," perhaps meaning a plant eaten by the clergy