Kvass is indeed vile, or at least to my western senses. I am sure I could get used to it over time as I did with Ginger beer.
The Mari a small cutural group located inPerm’ Province - traditionally offer a welcome of bread (Mari: kinde), butter (Mari: üi), and the local speciality, müi puraga (lit.Mari: pürö), an alcoholic drink made from fermented honey.
That is an unusual stuff but kinda tasty too!