Шаг 1
Take the required rye croutons and grind them in a blender.
Шаг 2
Transfer the rye crumbs into a pot. If you don’t like dark color and a slightly bitter taste, use 3/4 cup of crumbs.
Шаг 3
Pour 4 liters of water into another pot and bring it to a boil.
Шаг 4
Pour the boiling water into the pot with breadcrumbs and let it steep for 2–2.5 hours at room temperature.
Шаг 5
Take dry yeast and mix it with a small amount of water, about 3–4 tablespoons.
Шаг 6
Add sugar to the bread-water mixture.
Шаг 7
Then add the yeast.
Шаг 8
Cover with a towel and leave in a warm place for 10–12 hours.
Шаг 9
After 12 hours of fermentation, the mixture will look like this.
Шаг 10
Take cheesecloth folded several times, cover a colander and strain the kvass into a clean pot.
Шаг 11
Then, using a funnel, pour the kvass into a bottle, leaving about 1/8 of it empty.
Шаг 12
Add a few raisins and screw the cap on. Leave the kvass bottles at room temperature for 2–3 hours, then refrigerate for 2 days. Kvass is ready. Enjoy!