''Schwarzsauer'' is a North German

blood soup Blood soup is any soup that uses blood as a principal ingredient. List of blood soups Examples of blood stew include: * Black soup, a historical pork-blood soup of Ancient Greek cuisine particularly associated with ancient Sparta. * Chicken a ...

with various spices cooked in vinegar-water and a sort of black pudding made with vinegar. It is a traditional dish in parts of

northern Germany Northern Germany (german: link=no, Norddeutschland) is a linguistic, geographic, socio-cultural and historic region in the northern part of Germany which includes the coastal states of Schleswig-Holstein, Mecklenburg-Vorpommern and Lower Saxony an ...

and formerly also in

East Prussia East Prussia ; german: Ostpreißen, label=Low Prussian; pl, Prusy Wschodnie; lt, Rytų Prūsija was a province of the Kingdom of Prussia from 1773 to 1829 and again from 1878 (with the Kingdom itself being part of the German Empire from 187 ...

. It is similar to the Spartan black soup.Sophie Wilhelmine Scheibler: ''Allgemeines deutsches Kochbuch für alle Stände, oder gründliche Anweisung alle Arten Speisen und Backwerke auf die wohlfeilste und schmackhafteste Art zuzubereiten: Ein unentbehrliches Handbuch für angehende Hausmütter, Haushälterinnen und Köchinnen'', C.F. Amelangs Verlag, Leipzig und Berlin, 1866, S. 183 und 186

References

{{Reflist} German cuisine Blood soups