Kvas

 Kvas is one of  favorite Russian refreshing cold beverages.
 
 You will need:                                                     

1 lb black bread 
3 quarts water 
several raisins 
1/2 tsp yeast 
3-4 tbsp sugar
1/2 c sour berry juice 

   Preparation:

 Slice  bread thinly and let the bread roast in the oven until it`s completely dry. Put in a large utensil, pour over the boiling water. Don`t mix. Let stand for at least 3 hours or overnight in a cool place. Strain off the bread through a cloth.
 

 Heat the liquid to a lukewarm, add the yeast, mint and berry juice and let stand for 6-8 hours, covered with a towel. When a thin layer of bubbly froth appears on the surface, pour it into bottles through a cloth, drop a raisin into each bottle and cork the bottles well. Put Kvas into a cool place.
 Kvas will be ready  in 2 days.