Żurek is a traditional Polish soup known for its distinct sour flavor, derived from fermented rye flour, or zakwas. This hearty dish is typically enriched with ingredients like white sausage (biała kiełbasa), hard-boiled eggs, and occasionally potatoes, making it a comforting staple in Polish cuisine. Often served during Easter, Żurek's unique taste and warming qualities have made it a beloved culinary classic, reflecting Poland's rich cultural heritage and the importance of fermentation in Eastern European cooking traditions.