Þorramatur has also changed to reflect changing tastes. The traditional method of storing meat by submerging it in fermented whey, which gives the food a characteristic sour taste, is unfamiliar to most generations of Icelanders alive today and therefore a Þorramatur buffet usually has a choice between sour and nonsour pieces of the same food, served on separate trays as the acid readily contaminates food with which it comes into contact. However, some of the food, for example the rams' testicles, has to be cured by the acid before serving. A number of foods have been added to the buffet that have never gone out of fashion in Icelandic cuisine, such as smoked lamb, fermented shark and dried fish, which are still commonly consumed in all seasons. Þorramatur also may include some novelties, traditional food that was strictly regional and even rare as such, and unfamiliar even to the older generation. Examples include seals' flippers, known only from the Breiðafjörður area, which is sometimes, albeit rarely, served as part of Þorramatur.