fermented baked milk drink, ryazhenka, russian and ukrainian cuisine, kefir, bacterial fermentation starter in a glass on a white

background beverage bowl breakfast buttermilk calcium cheese closeup concept cooking cuisine culinary cup delicious dessert diet drink eat eating fermentation food fresh glass health healthy homemade ingredient jug kefir meal milk morning natural nutrient nutrition organic preparation product rural rustic ryazhenka spoon sweet table tasty traditional village white yoghurt yogurt