If you’re a fan of hearty, comforting soups with a tangy twist, then Zurek Na Zakwasie (Polish Sour Rye Soup) deserves a spot on your table! 

This traditional dish, deeply rooted in Poland’s culinary heritage, is more than just a soup – it’s a symbol of home, family, and centuries-old traditions.

Zurek, pronounced “zhurek”, derives its name from the Old Slavic word zur, meaning, sour. It’s defining characteristic is the tangy flavor from zakwas – a fermented rye starter made with just water and rye flour. This starter has been a cornerstone of Polish cuisine for centuries, with mentions of sour soups dating back to medieval times. 

Zurkek’s origins are humble, it was a peasant dish designed to stretch simple, affordable ingredients. Over time, it became a staple during Lent, as it’s hearty ingredients provided sustenance during the fasting season. Today, Zurek is synonymous with Easter, often served as the centerpiece of the holiday meal, accompanied by hard-boiled eggs and white sausage (biala kielbasa). While Zurek is uniquely Polish, its concept has inspired variations across Central and Eastern Europe. In Slovakia, a similar dish called kysla polievka used fermented wheat or barley. In the Czech Republic, a sour soup called kulajda incprorates cream and dill for a slightly sweeter flavor. In Belarus and Ukraine, you’ll find kyselytsia, a tangy soup made with fermented oat or rye flour. In Lithuania, rugstyniu sriuba (sorrel soup) offers a sour taste but uses sorrel leaves instead of a fermented base. What sets Zurek apart is its balance of sourness with smoky, savory notes from cured meats and sausage, creating a harmonious blend of flavors. 

Zurek is an excellent soup for meal prepping, as its flavors deepen over time. To store it, allow the soup to cool to room temperature, then transfer it to an airtight container. It will keep in the fridge for up to 4 days. For longer storage, freeze Zurek in individual portions. It can last up to 3 months in the freezer. Note that the potatoes may slightly change texture upon reheating, but the flavor remains intact. Any leftover starter can be refrigerated in a sealed jar for up to 2 weeks.