Step 1

Line a 1.2litre/2pint round-bottomed bowl or pudding basin with damp muslin or cheesecloth, leaving it hanging over the rim.Put all but 3 Tbsp of the liqueur in a shallow dish, dip in the sponge fingers one at a time and use to line the bowl or basin, placing them sugared side outwards. Fill the bottom and any gaps with liqueur-soaked trimmings so that the lining is completely solid.Chill for 30 minutes. Reserve the remaining sponge fingers and liqueur.Whip the cream with the icing sugar until very thick and standing in stiff peaks.

Step 2

Transfer three-quarters to a separate bowl. Stir the nuts and chocolate chips into the remaining one-quarter, then spread this over the sponge fingers to make an inner lining. Return to the refrigerator.

Step 3

Put the chocolate pieces and remaining 3 Tbsp liqueur in a heatproof bowl. Stand the bowl over a pan of gently simmering water and heat gently, stirring occasionally, until the chocolate has melted and is smooth.

Step 4

Remove from the heat and leave to cool slightly, then

Step 5

Place a plate with heavy weights on top and chill overnight.To serve, remove the weights and unfold the muslin, then run a palette knife carefully between the muslin and the bowl/basin. Invert a serving plate over the mould and turn the Zuccotto out onto it.Carefully remove the muslin. Decorate with alternate sections of sifted cocoa powder and icing sugar. Fold a circle of greaseproof paper into 8 sections, then cut out each alternate one.

Step 6

Place over the Zuccotto and sift over the cocoa powder, then move the paper around so that the cocoa powder is covered and sprinkle with the icing sugar. If you are in a rush the Zuccotto can, of course, be simply dusted with either icing sugar or cocoa instead of both but the decoration is worth the effort for a special occasion.