It is difficult to believe that 3 ingredients can make such an amazing cake. Of course, as there are so few, the flavour of your hazelnuts will be the most important factor in the success of this cake. Piedmontese hazelnuts are renowned for their flavour but just find a nice tasting hazelnut for this cake. I like to serve this cake with a dollop of whipped cream and some pears sautéed in butter, honey and vanilla.