Kvas is a traditional Russian non-alcoholic beverage, made with yeast and rhy bread. Tastes a bit like malt beer or beer, but sweeter.

Kvas recipe
Ingredients : boiled water - 4 l., yeast - 20-25 gr., sugar - 500 gr., rye bread - for 800 gr. crackers , mint - 25 gr., raisin - 50 gr.
Method:
Prepare 9-10 bottles for Kvas, they must be very clean. If you don't want so much this beverage, reduce the number of ingredients. Cut rye bread into thin pieces and put it in the oven until they get brown. Put 800 gr. crackers into a pan or a small barrel, then pour 4 l hot boiled water. Leave this extract for 4 hours. Then filter it and add yeast, sugar (put sugar on your taste, if it is not enough, you can always add some sugar before drinking) and mint. Cover the pan with napkin and leave for fermentation during 5-6 hours. When Kvas begins to foam, filter it again and then pour it in the bottles (put on the bottom of bottles some raisins) and cork up very very good. After that fasten the corks with a rope. Put the bottles in a cool place and lay them aflat. Kvas will be ready in 2-3 days.