Polish National Dishes

Żur rzeszowski: Podkarpackie sour rye soup with dried mushrooms

Żur rzeszowski is a regional sour rye soup from the Rzeszów area of Podkarpackie, southeastern Poland. It is listed on Poland’s List of Traditional Products, whose description highlights a medium-thick, pourable soup with a light grey, creamy-grey appearance, visible dark dried mushrooms and a mild sour taste with a clear mushroom aroma. The listing dates to 2007 and describes traditions shared by Rzeszowiacy and Lasowiacy communities.

Polish National Dishes
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A wide view of „Żur rzeszowski: Podkarpackie sour rye soup with dried mushrooms“ arranged on a table for serving.
Yield 6 bowls, each with about 250 ml soup and 100 g potato
Serving 1 bowl of mushroom rye soup with a portion of boiled potatoes
Active preparation about 15 minutes
Cooking about 40 minutes
Ingredients ↓
At a glance

Żur rzeszowski: Podkarpackie sour rye soup with dried mushrooms

Żur rzeszowski is a regional sour rye soup from the Rzeszów area of Podkarpackie, southeastern Poland. It is listed on Poland’s List of Traditional Products, whose description highlights a medium-thick, pourable soup with a light grey, creamy-grey appearance, visible dark dried mushrooms and a mild sour taste with a clear mushroom aroma. The listing dates to 2007 and describes traditions shared by Rzeszowiacy and Lasowiacy communities.

The regional record preserves more than one way to prepare żur. A historic rye or oat barszcz was stirred and strained into boiling water; dried mushrooms or crumbled homemade cheese could be added, and potatoes were served alongside. Other accounts describe milk, eggs, cured meat or potatoes in different meals and seasons. This measured home version focuses on the signature dried mushrooms and potatoes, using refrigerated ready-to-use rye starter for a manageable method.

The soup should pour easily while still coating a spoon lightly. Its pale grey rye base, dark mushroom pieces and separate tender potato chunks create the defining contrast. The 750 ml of starter is diluted with 375 ml boiling water, following the historical description’s half-volume water ratio for the rye base; strained mushroom infusion is then added for flavor. Starter acidity varies, so taste before seasoning. Serve the potatoes in each bowl or on the side, according to preference.

Tips for the best result

Tips for the best result

  • Choose identified edible dried mushrooms from a reliable food source; do not use unidentified wild mushrooms.
  • Refrigerate the covered mushrooms while they soak, then strain their liquid through a fine sieve or clean coffee filter to remove grit.
  • Simmer the mushrooms in the strained soaking liquid until fully tender so the broth has a clear mushroom flavor.
  • Whisk the rye starter smooth before adding it gradually to boiling water; keep whisking to prevent lumps.
  • The soup should be medium-thick and pourable. If it seems too thick, loosen it with a little boiled water; if too sharp, add a small splash of hot water and taste again.
  • Boil the potatoes separately and drain them well so they remain distinct rather than breaking down in the sour soup.
  • Add salt only after combining the starter and mushroom broth; commercial starters differ in salt and acidity.
Ingredients

Ingredients

Mushroom rye soup

  • 750 ml refrigerated, ready-to-use rye żur starter (zakwas), stirred smooth
  • 375 ml boiling potable water
  • 30 g dried edible mushrooms, such as porcini, inspected
  • 450 ml potable cold water for soaking and cooking the mushrooms
  • Up to 2 g fine salt, added only after tasting

Boiled potatoes

  • 600 g potatoes, peeled and cut into 2 cm pieces
  • 1.5 l itres water for boiling the potatoes
  • 6 g fine salt for the potato water; most is discarded
Method

Method

Directions

  1. Soak the mushrooms.Inspect the dried mushrooms and discard any with mould, insects or foreign material. Cover them with 450 ml cold water in a clean bowl, cover the bowl and refrigerate for 25 minutes.

  2. Cook the mushrooms.Lift the mushrooms out and strain the soaking liquid through a fine sieve or clean coffee filter to catch grit. Return the liquid and mushrooms to a small saucepan. Simmer for about 25 minutes, until the mushrooms are fully tender and dark brown. Keep the mushroom liquid.

  3. Boil the potatoes.While the mushrooms simmer, bring 1.5 litres water and 6 g salt to a boil in a separate pot. Add the potatoes and cook for about 15–18 minutes, until a knife slides easily into the largest pieces while they still hold their shape. Drain well; discard most of the salted water.

  4. Dilute the rye starter.Bring 375 ml water to a boil in the heavy soup pot. Stir the refrigerated starter until smooth, then pour it gradually into the boiling water while whisking. Return the mixture to a gentle simmer and cook for 5 minutes.

  5. Add the mushrooms and their broth.Add the fully cooked mushrooms and their strained cooking liquid to the rye base. Simmer gently for 5 minutes. The soup should be light grey or creamy-grey, medium-thick and pourable, with visible dark mushroom pieces.

  6. Season and add the potatoes.Taste the soup before adding salt. Add up to 2 g fine salt only if needed, since starter products vary. Add the drained potatoes and simmer for 2–3 minutes, just until hot without breaking them up.

  7. Serve the soup.Divide the mushroom soup among six bowls and portion about 100 g potato with each serving, either in the bowl or alongside. Serve hot.

Nutrition and allergens

Nutrition and allergens

  • Energy165 kcal
  • Carbohydrate35 g
  • Protein5 g
  • Fat1 g
  • Fibre5 g
  • Sodium250 mg
  • Allergens and dietary notesrye; the ready-to-use starter commonly also contains wheat/gluten, depending on the product. Check its label. This measured version contains no dairy, egg or meat.

Approximate values per bowl with potatoes: - Energy: 165 kcal - Carbohydrate: 35 g - Protein: 5 g - Fat: 1 g - Fibre: 5 g - Sodium: 250 mg - Allergens and dietary notes: rye; the ready-to-use starter commonly also contains wheat/gluten, depending on the product. Check its label. This measured version contains no dairy, egg or meat. Nutrition is estimated for one sixth of the measured recipe using generic values for rye starter, boiled potatoes and dried mushrooms. Sodium varies with the starter and the amount of salt absorbed by the potatoes; these values are rounded estimates, not a laboratory analysis.

Nutrition and allergens

Nutrition and allergens

Serving, storage and reheating: Serve a bowl of the mushroom rye soup with about 100 g boiled potato. The potatoes can be placed in the soup or served separately, as the regional description allows. Keep the mushrooms visible and distribute them evenly among the portions.

Serving, storage and reheating: Transfer leftovers to shallow containers and refrigerate within 2 hours at or below 4 °C. Use within 3–4 days. Reheat the soup throughout to 74 °C, stirring so it warms evenly. Do not leave cooked soup at room temperature for more than 2 hours, or more than 1 hour when the surrounding temperature is above 32 °C.

Serving, storage and reheating: The mushrooms can be soaked and cooked earlier the same day; refrigerate them with their strained cooking liquid until needed. Boil the potatoes shortly before serving so they hold their shape. Follow the starter package’s storage directions after opening. A documented regional variation adds crumbled homemade cheese instead of mushrooms; this changes the measured recipe and adds milk, so check the cheese label and adjust the serving separately.

Approximate values per bowl with potatoes: - Energy: 165 kcal - Carbohydrate: 35 g - Protein: 5 g - Fat: 1 g - Fibre: 5 g - Sodium: 250 mg - Allergens and dietary notes: rye; the ready-to-use starter commonly also contains wheat/gluten, depending on the product. Check its label. This measured version contains no dairy, egg or meat.

Nutrition is estimated for one sixth of the measured recipe using generic values for rye starter, boiled potatoes and dried mushrooms. Sodium varies with the starter and the amount of salt absorbed by the potatoes; these values are rounded estimates, not a laboratory analysis.

Frequently asked questions

Frequently asked questions

What distinguishes Żur rzeszowski?

The listed soup is medium-thick and light grey or creamy-grey, with dark dried mushrooms, a mild sour taste and a clear mushroom aroma. The amount of starter and water changes its thickness and acidity.

Does the registered tradition require one fixed set of toppings?

No. The regional description records several additions, including mushrooms, homemade cheese, cured meat and eggs, and also describes potatoes served with żur. This measured version chooses dried mushrooms and potatoes.

Can I use oat starter instead of rye?

A historic regional description mentions both rye and oat barszcz. This version is measured for rye starter, so an oat-based product will change its flavor, texture and possibly allergens; check the label and adjust the water gradually.

To finish

To finish

  • Simmer dried mushrooms in their strained soaking liquid and combine them with a lightly sour rye base diluted with boiling water.
  • Serve six bowls with visible dark mushrooms and tender boiled potatoes, keeping the soup medium-thick and pourable.
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