Luiren Spring Cheese is a perfectly normal if rather bland cheese that is made in the small, heavily wooded kingdom of Luiren in the Forgotten Realms. Rather bland, that is, to humans and other non-halfings. To halflings – who make up the vast majority of the population of Luiren – it is better known as Cheeeeeeese!.
This is because to halflings, Luiren Spring Cheese is a highly intoxicating substance, the equivalent to a strong red wine for humans. This effect is widely known among other sentient species, hence its other names of Halfling Cheese, Mind Cheese and, of course, Halfling Mind Cheese.