Place the empty petit four cases on a tray or saucer and pour the Kroccant onto the bottom of each one.
Fill the cases with a drained Amarena Fabbri, nuts to taste (walnuts, hazelnuts, almonds, pistachios) or fruit in Fabbri liqueur (Cherries, Apricots, Grappuva, etc.).
Place the tray in the fridge for a few minutes: the pralines will be ready in no time!