Prepared with a slow, natural leavening process, filled with sultanas and candied fruit. The finishing touch: a crunchy hazelnut icing. Only a cake can seriously unite Christmas and the harmony and sweetness which characterise the festive period. The panettone has always been indisputably at the heart of Christmas get-togethers as tradition dictates. Panettone has always been indisputably at the center of Christmas gatherings, as tradition dictates.