Beat the eggs with the sugar until increase in volume in 2-3 times, then add sour cream, stir, add condensed milk, mix well. Sift the flour and add to the dough (it is better all the flour at once to pour out, leave a couple of spoons, to see the consistency, and then add!). Soda to extinguish a few drops of vinegar, add to batter, mix well.

Spread half of the batter into a separate bowl, add cocoa powder, mix until smooth.

Grease the bowl multivarki butter, to probility flour. Put alternately a spoonful of dark dough, then in his mid - spoon light test, and so until the end of the dough. To turn on the mode "Pastries" 50 minutes after the end of the program to turn the cake, using a pan for steaming and to keep "Baking" for 25 minutes. After the program is finished allow to cool the cake for 20 minutes without opening the cover.