Cut the rye bread into slices or cubes with a side of about 2-3 cm. Preheat the oven to 180°C (top-bottom). Place the bread on a baking sheet lined with parchment paper and toast for 15-20 minutes until it is well browned — it should have a dark brown color and an intense aroma of caramelized grain. Toasting will give you a deeper flavor and a nicer color to the sourdough.
Description
Traditional summer bread kvass in the Greater Poland style: a slightly sour, slightly sweet carbonated drink based on rye bread, served with a thick puree of Polish apples and garnished with a thin slice of pear. Inspired by local, rural flavors of Greater Poland — homemade bread gives a deep, baked aroma, while the apple puree adds freshness and creamy texture. The drink is perfect as a refreshing addition to summer barbecues, picnics, and feasts; serve chilled in tall glasses, with a spoon for the puree. In a sugar-free version, you can reduce the sugar and add honey or more raisins; if you want a stronger fizz — leave it for a second, shorter fermentation in bottles.
Ingredients Used
Ingredients (11)
- Rye bread 400 g
- Water 3000 ml
- Sugar 250 g
- Fresh yeast 20 g
- Lemon 1.3 pcs (~100 g)
- Mint 30 g
- Apple 3.3 pcs (~600 g)
- Pear 1 pcs (~180 g)
- 🌿 Spices
- Salt 1 g
- ✨ Optional
- Raisins 50 g
- Cinnamon 2 g
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Preparation steps
Bread preparation
Brewing
Place the toasted bread in a large pot with a capacity of at least 4 liters. Pour in 3000 ml of boiling water and immediately cover with a lid. Set aside for 4-6 hours in a warm place to allow the bread extract to release its color and flavor — the infusion should be dark brown and smell of bread. Stir at least once with a wooden spoon to release the crumb from the slices.
Draining and Cooling
After steeping, strain the infusion through a fine sieve or cheesecloth into a large bowl or another pot. Press the bread pieces with a spoon to extract as much liquid as possible. Allow the infusion to cool to room temperature, about 25°C — it should be pleasantly warm, not hot.
Sweetening and initial seasoning
To the cool infusion, add 200 g of sugar and the juice squeezed from half a lemon (about 50 g). Stir until the sugar is completely dissolved. Add mint (leaves), and optionally raisins — they will speed up fermentation and add a fruity note. Cover the pot with cheesecloth and set it in a warm place (about 20-24°C) for 12-18 hours. After this time, the infusion should start to bubble slightly and have a delicate, tangy aroma.
Second fermentation (optionally with yeast)
If you want to speed up carbonation or the flavor will be too weak, dissolve the remaining 50 g of sugar in 100 ml of warm water (about 30-35°C) and crumble 20 g of fresh yeast into this water. Let it sit for 5-10 minutes until a foam forms. Add the starter to the infusion, mix thoroughly, and pour the brew into clean bottles with closures (preferably glass bottles with a 'kłos' cork or caps). Seal and leave at room temperature for 12-24 hours, checking the pressure of the bottles (they should be firm to the touch).
Preparation of apple mousse
Peel the apples, remove the cores, and cut them into cubes. Place the apples in a saucepan, add 30 g of sugar (part of the sugar from the list), 30 ml of water (you can use a small portion from the total amount), and a pinch of salt. Cook over medium heat for 12-15 minutes, stirring every few minutes, until the apples are soft and falling apart. If you are using cinnamon (optional), add it at the end of cooking.
Cooling the mousse and the acid
After the second fermentation, place the bottles in the refrigerator for at least 8 hours (preferably 24 hours) — this will stop the fermentation and chill the drink. Cool the apple juice to room temperature, then store it in the refrigerator in a covered jar. The juice should be thick, aromatic, and slightly sweet and sour.
Portioning and serving
For each serving (about 300-350 ml of the drink), place 2-3 tablespoons of apple puree at the bottom of a tall glass. Gently pour in the chilled kvass so that the puree floats and creates decorative layers. Top with a thin slice of pear as a garnish and a mint leaf. Serve immediately with a long spoon.
Control and safety
Before serving, check the smell and taste of the sour drink — it should be pleasantly sour, slightly sweet, and fizzy. If there is a sharp, unpleasant smell or mold, discard the beverage. Open the bottles carefully (there may be excessive carbonation) — twist slowly while holding over a bowl.
Fun Fact
Bread kvass is a drink with a long history in the Central and Eastern European region; in Greater Poland, it was once made on peasant farms as an inexpensive way to refresh and utilize stale bread.
Best for
Tips
Serve well chilled in transparent glasses with a layer of apple puree at the bottom and a slice of pear on the rim. For children, you can reduce the fermentation time to make the acid less sour; for adults, optionally add a shot of vodka or herbs (e.g., rosemary) for a twist.
Store bottles in the refrigerator for 5-7 days. After opening, keep in the refrigerator and consume within 2-3 days. If the drink becomes overly carbonated, move the bottles to a cooler place and open slowly to reduce pressure.
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