Scramble egg yolks with sugar, vanilla sugar and salt. Beat until the mass has lightened and the sugar have dissolved.

Add the curd to the egg and sugar mass and spoon everything down with a wooden spoon.

Rub the banana with a fork to a porridge-like mass and add it to the curd and egg mass. Using a small grater, grate the top of the orange peel and add it to the dough.

Melt the butter over a low heat, stirring constantly to prevent it from boiling. Add to the dough and mix. Add flour (it is important that the mass is not very thick, that is, unformed lumps) and individually beaten egg whites. Stir gently (bottom to top, one way).

Add raisins and mix everything gently.

Grease the baking sheet with butter and sprinkle with ground breadcrumbs.

Bake for about 60 minutes in a preheated oven up to 180 degrees until well browned.