The debate about okroshka is over - you should make it with kvass.
In Russia, GOST has been approved for dishes from traditional Russian cuisine, describing the composition and preparation methods of 132 dishes. It also contains the answer to humanity's main question about okroshka, and now it's official - okroshka should be made with kvass, not kefir.
- Well, we finally admitted it as a matter of course.
- Kefir still tastes better.