Chocolate with butter put melted over very low heat in a saucepan until smooth and remove from the heat, the main thing - that in no case does not boil the chocolate!

B proteins add half of the sugar and start whisking.

At this stage add lemon juice and whip for another five minutes...

whites have twice the increase in volume and become soft, resistant peaks.

Beat the egg yolks with rest of sugar until creamy.

B proteins pour in the yolks and gently stir with a spatula...

add the chocolate and butter and mix gently until a homogeneous mass,

I the bottom and sides of the form was covered with parchment, pour carefully our mass and put in oven at 140-150 gr. until Golden brown upper crust, it took me 35 min., after some time take out from the oven carefully and put on 12 hours to cool in the baking pan, then put in the fridge for 15 hours (7 hours in fridge and 4 hours in the freezer). That's all I got out of the freezer and removed from the mold, cut into pieces, wrapped in foil and put in the freezer, a left a piece with some tea and ate it bliss.

Here's to you sideways.