Russian pancakesIngredients:Eggs ................... 2 pcs.Sugar ............ 40 gKefir (yogurt) ............ 500 gHot water .............. 250-300 mlVegetable oil …………… 30 gBaking soda ……………… ½ tsp.Salt …………. pinchVanilla extract ………… .. 1 tsp.Flour ……………. 300 gUnsalted butter …………..