RUB the zest from the orange and RUB it with sugar. So that the sugar becomes moist and absorbs the flavor of the zest.
Next, in the bowl of the mixer, mix all the dry ingredients (flour, sugar, cocoa, baking powder, salt, soda). In the hotel container, combine the liquid ingredients, except milk (eggs, melted butter, yogurt, orange juice 30 gr).
At low speed, add the liquid ingredients. Then add the milk. At higher speeds, whisk until smooth.
Bake in a ring with a diameter of 16 cm, at 160 degrees Celsius, 40 minutes.
Ready-made sponge cake can be used immediately, but it is desirable to wrap the film and put it in the refrigerator overnight.
Cut the biscuit into 3 parts.