Separate cold eggs into whites and yolks.
Beat the egg whites with a mixer until soft peaks form, starting at low speed and increasing to maximum. Gradually add sugar. Beat for another 3 minutes. The mixture should become glossy. Add starch, vinegar and beat until peaks form at maximum speed.
Proceed to laying out the whites in the form. To do this, take a baking sheet covered with parchment. Lay out half of the whites carefully, smooth out a circle with a diameter of 20 cm. Put the second half on top in the form of a dome. Smooth out with a spatula. The cake will be 4-5 cm high.
Place the pan in the oven. Bake the dessert for 1.5 hours and do not open the oven door to prevent the cake from cracking.
Turn off the oven and leave overnight or for a day to cool. Do not take the meringue out for at least five hours. Then transfer the cake to a plate, using a knife to help loosen the edges of the meringue from the paper.
Make the cream. Whip the cream, vanilla and sugar until thickened or foamy. The mixture should be silky and smooth.
Just before serving, spread the cream over the cake. Decorate with fruits and berries. Make mascarpone balls.