For the biscuit: separate the whites from the yolks.
Beat the whites to a fluffy foam, add 100 g of sugar.
The second part of the sugar in 100 g is sent to the yolks. Rub the sugar with the yolks.
Combine the whites, yolks, ground with sugar and flour.
Place the dough on a baking sheet lined with parchment paper and bake at 180 degrees for 15-20 minutes. check the readiness of the biscuit with a wooden stick (if the dough does not stick, then it is ready).
For the filling, mash the halva with a fork.
And add to the softened butter, beat with a mixer until smooth.
Remove the sponge cake from the oven and immediately wrap it in a damp towel. Let it cool down.
Spread the filling on the cooled biscuit, roll it into a roll.