Frankfurter würstchen

A Frankfurter Würstchen is a thin parboiled sausage in a casing of sheep's intestine. The flavour is acquired by a method of low temperature smoking. For consumption, Frankfurters are occasionally not boiled; they are heated in hot water for only about eight minutes to prevent the skin from bursting. They are also commonly grilled over propane or charcoal flame. They are traditionally served with bread, mustard, horseradish and/or potato salad. Meat sausages as a Frankfurt speciality are already mentioned in medieval sources, often served during the Imperial coronation ceremonies at the Römerberg. Smoked Frankfurter Würstchen have protected geographical status in Germany since about 1860. Since 1929, the indication is only allowed to be used for sausages that are produced in the Frankfurt area, mainly in Neu-Isenburg and Dreieich. Originally, Frankfurters were made without nitrite curing salt. After going through specific aging and smoking processes, the sausages, now of a golden colour, are put into wooden boxes with small sheet of parchment paper between layers. Therefore, the traditional sausages have a square cross-section, but there are a few exceptions where the sausage is round.

Source: Wikipedia