Winkles Old Peculiar
Ankh-Morpork's favorite and signature beer (brewed with the flavorful and nutritious waters of the River Ankh). It even enjoyed a brief vogue among the aristocracy when Earl de Nobbes introduced them to it in Feet of Clay. It a also one of the many drinks of the festivities of the Wizards at the Unseen University.
Annotation
Roundworld has Theakston's Old Peculier (note spelling), brewed in North Yorkshire.