To get this currently, you have to hunt down the Chemist Mouse (GGT) and pick up the Wicked Gnarly Cheese potion. Imbue a few sb+ or brie and you'd begin to get a load of these.
Go to the lagoon for the Silth Mouse.
Formed by a gnarly magical process which transforms it from a relatively normal lump of dairy products into a dried-up ball of roots, this cheese is so twisted and covered with strange wood-grain patterns that it's hard to tell that it's cheese at all. Extremely Gnarly Cheese has got a much sharper scent than its counterpart, Gnarled Cheese, and a flavor that combines the zing of sandalwood and the sweetness of maple, which makes it like candy to some denizens of the Lagoon.