Zungenwurst

Blood tongue, or Zungenwurst , is a variety of German head cheese with blood. It is a large head cheese that is made with pig's blood, suet, bread crumbs and oatmeal with chunks of pickled beef tongue added. It has a slight resemblance to blood sausage. It is commonly sliced and browned in butter or bacon fat prior to consumption. It is sold in markets pre-cooked and its appearance is maroon to black in color. It is also sold in some delis as a cold cut.

Source: Wikipedia