Okroshka on white kvass with radish and mustard

My childhood favorite okroshka has sparkled with new flavors! The taste of okroshka is spicy with a slight bitterness, cold kvass with a pleasant sourness, and all together gives an unforgettable taste of a Russian summer dish that more than one person has not refused. I really like it and I want you to try this okroshka too. I had never tried such kvass before, but fate brought me together with one grandmother, she treated me to okroshka on kvass made from rye flour and black radish with mustard, I will say that right away I didn’t understand what kind of basis this was for okroshka, but then When I found out the recipe, I was very surprised and wrote it down, I liked this okroshka so much, now this is the only way I cook it, thanks to that grandmother!