The butter mix with sugar until foaming, add, having broken one by one, the egg yolks, rum, crushed or ground biscuits, chocolate or cocoa, vanilla. Finally add the walnuts. Blended into a homogeneous mass. It is formed of a thin rolls, from which pieces are cut and shaped ovule. They shall be placed on a tray and place in the fridge to firm. Cured ovule is beautifully wrapped in colorful foil notes, rank in favors and stored in the refrigerator. If the mass of candy to prove insufficient soft, add butter.