For the Danube waves, beat eggs, powdered sugar until foamy. Gradually add the oil and water. Finally, fold in the flour sifted with baking powder and cocoa powder.
Spread the dough on a baking sheet and bake at 180 degrees for about 40 minutes. Let the dough cool down and cut into sticks.
For the foam, beat egg whites with 70 g fine crystal sugar until stiff. Bring water and remaining fine crystal sugar (300 g) to a boil and boil for about 3 minutes.
Turn on the mixer and carefully add the hot sugar water to the beaten egg whites at the highest speed for a few minutes until the foam is completely firm.
Immediately pipe the foam onto the sticks and glaze with chocolate icing.