Brain sausage is called Hirnwurst.
Hirnwurst is a German term for Gelbwurst and is a traditional German sausage.
Gelbwurst is a pale gray, mild flavored sausage which originated in Bavaria, Germany.
It is often made from pork, veal and spices like cardamom, nutmeg, ginger and lemon.
Hirnwurst is the Gelbwursts sausages original recipe and is included up to 25 percent pig brains.
Gelbwurst was invented in the year of 1905 and is made from pork, veal, and a combination of spices such as ginger and nutmeg.
Traditionally, the Gelbwurst sausage contained brains, although this is no longer the case, it is still sometimes referred to as Hirnwurst "brain sausage" in certain parts of Germany.