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Żurek from Sourdough Discard
A Polish sour rye soup built by turning ordinary rye sourdough discard into a proper żur starter before making the soup.
Żur starter
- Rye sourdough discard
- Fresh rye flour
- Water
- Garlic cloves, lightly crushed
- Bay leaves
Convert the discard
- Put the rye sourdough discard in a clean jar and refresh it with rye flour and enough water to make a loose, pourable rye mixture rather than a bread dough.
- Add lightly crushed garlic and bay leaves.
- Cover loosely and leave on the counter for 24–48 hours, until distinctly sour, aromatic, and active. This is the point where ordinary bread discard has become a proper żur base for the soup.
- Stir before using; the flour naturally settles.
For the soup
- Prepared żur starter
- Broth or water
- Potatoes, cut into large pieces
- Carrots, cut into large pieces
- Onion, sliced
- Polish sausage, browned or grilled
- Hard- or medium-boiled eggs
- Marjoram
- Black pepper and salt, to taste
- A little cream, optional
- Fresh parsley, to finish
Method
- Begin by gently browning the sliced onion in a little extra-virgin olive oil until softened and lightly golden.
- Stir the fermented żur starter well and add it directly to the onions. Cook for a moment, stirring, so the rye mixture is evenly distributed.
- Slowly incorporate the stock and then enough water to reach the volume and strength you want, stirring continuously so the starter disperses smoothly rather than forming lumps.
- Add the potatoes, carrots, and other vegetables directly to this sour rye broth. Simmer them in it until tender. This longer simmer is important: the flour from the starter cooks along with the vegetables, which removes any raw-flour taste and gives the soup its characteristic body.
- Add the browned or grilled Polish sausage toward the end and season with marjoram, black pepper, and salt to taste.
- Adjust the final balance with more stock, water, or a little additional starter if needed. Add a small amount of cream if you want a rounder finish, while keeping the sour rye flavour clearly present.
- Serve hot with boiled egg, sausage, potatoes, vegetables, and fresh parsley.
Notes
The project has two stages. First, rye sourdough discard is converted into a proper żur starter by refreshing it with rye flour and water, adding garlic and bay leaves, and fermenting it for another 24–48 hours at room temperature. Second, the starter is cooked as part of the soup itself: it goes in immediately after the browned onions, before the stock, water, and vegetables. Cooking the vegetables directly in this rye broth gives the flour enough time to cook fully while the soup develops its body.