Roast the hazelnuts in a pan without fat, remove from the pan and allow to cool. Finely crumble the sponge cake. Whip cream until stiff. Mix mascarpone and almond liqueur. Add cream and sponge crumbs and mix well.
Form approx. 64 balls from the mixture with moistened hands and roll them in the hazelnuts. Refrigerate for about 1 hour, then place in praline sleeves. Store in a cool place. Results in approx. 64 balls.