That's the name of the recipe used in the Czech Republic. It is a reaction using red phosphorus, phosphoric acid and the gradual addition of iodine. It's a very fast reaction, which is probably not used much in the West, and there's no mention of it by chemists here. It's also called 2x20minutes.
Somewhere here foreigners were discussing why Czech meth works much better and differently than theirs.
Someone there mentioned that it's because of this procedure, but this procedure if you don't know the exact steps of what and how, it doesn't end well.
And of course, even though there are a few people here who know, they don't want to share because it's just that Czechness is not denied even in this community....