sour rye soup

A Polish traditional soup whose fermented rye, wheat, and oats form a sourdough-like base, stirred into stock that may include boiled sausage, bacon, hard-boiled eggs, potatoes, and dried mushrooms.

unevidencedThis dish was found through Wikipedia and is classified, but its claims have not yet been checked against a source. Treat the details as a starting point, not as settled fact.