Wienrich and Boettcher were, naturally, foreigners, and according to Ank-Morpork's Guild of Confectioners, they did not understand the peculiarities of the city's taste buds. Ankh-Morpork people, said the guild, were hearty, no-nonsense folk who did not want chocolate that was stuffed with cocoa liquor and were certainly not like effete la-di-dah foreigners who wanted cream in everything. In fact, they actually preferred chocolate made mostly from milk, sugar, suet, hooves, lips, miscellaneous squeezings, rat droppings, plaster, flies, tallow, bits of tree, hair, lint, spiders, and powdered cocoa husks. This meant that, according to the food standards of the great chocolate centers in Borogravia and Quirm, Ankh-Morpork chocolate was formally classified as "cheese" and only escaped, through being the wrong color, being defined as "tile grout."
Terry Pratchett, Thief of Time