This article needs additional citations for verification. (April 2013)
Liverwurst, leberwurst, or liver sausage is a kind of sausage made from liver. It is eaten in many parts of Europe, including Austria, Bulgaria, Croatia, the Czech Republic, Denmark, Finland, Germany, Hungary, Latvia, the Netherlands, Norway, Poland, Romania (especially in Transylvania), Russia, Serbia, Slovakia, Slovenia, Sweden, Ukraine, United Kingdom; it is also found in North and South America, notably in Argentina and Chile.
Some liverwurst varieties are spreadable. Liverwurst usually contains pigs' or calves' liver. Other ingredients are meat (notably veal), fat, and spices including ground black pepper, marjoram, allspice, thyme, ground mustard seed, and nutmeg. Many regions in Germany have distinct recipes for liverwurst. Adding ingredients like pieces of onion or bacon to the recipe make each variety of liverwurst very important to cultural identity. For example, the Thüringer Leberwurst (Thuringian liverwurst) has a Protected Geographical Status throughout the EU. Recently, more exotic additions such as cowberries and mushrooms have gained popularity.
In some parts of Germany, liverwurst is served sliced on a plate, often with mustard or pickled cucumber. It is most commonly eaten spread on bread, as it is very soft.
In the Netherlands, liverwurst (Dutch: leverworst) is customarily served in slices, often with mustard. Groningen and The Hague are known for their own types of liverwurst: Groninger leverworst in Groningen and Haagse leverworst from The Hague.
In Hungary, liverwurst is customarily served on open sandwiches, or with cheese as a filling for pancakes which are baked in the oven.
In Romania, liverwurst is called lebărvurst, lebăr, or cârnat de ficat. Unlike the German sausage Leberwurst that uses beef, the lebăr uses only pork.
Liverwurst is typically eaten as is, and often served as traditional or as open-faced sandwiches. It is popular in North America with red onion and mustard on rye or whole grain bread. In the Southern and Midwestern US, liverwurst is served with slices of sweet pickles (gherkins pickled with vinegar, sugar, and mustard seeds). In the Northeast US, liverwurst is served with dill pickles (gherkins pickled with vinegar, salt, and dill).
In the Midwestern US, liverwurst is also known as liver sausage or Braunschweiger. Liverwurst is typically served on crackers or in sandwiches. It is often sold pre-sliced.
The Polish pasztetowa is made using calf's liver. It is often served on rye bread with horseradish-style mustard. Pasztetowa is popular throughout the year, but is most frequently served at Christmas and Easter.