Klassisk vinterfruktkaka

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1. 1
   Lightly beat the egg white in a shallow bowl and spread out the caster sugar on a baking sheet or tray. Dip the grapes and the holly or bay leaves into the egg white, or use a paintbrush. Shake off the excess, then coat in the sugar. Set aside to dry for at least 10 mins, ideally about 30 mins.
2. 2
   When you’re ready to decorate, make the frosting. Put a large bowl over a pan of simmering water, making sure the bottom of the bowl does not touch the water. Put the egg whites and icing sugar into the bowl and whisk for 5-7 mins until you have a thick, very glossy frosting. Use a spatula to clean around the edges of the bowl every so often as you whisk. Scoop the frosting onto the top of the cake and spread it around with a flat-edged knife, swirling as you go to create a snowy effect (see Knowhow, below).
3. 3
   Halve the clementines, figs and kumquats, then arrange on top of the frosted cake with the physalis, frosted grapes and leaves. Fix a ribbon around the base and leave the cake somewhere cool – but not the fridge – until your guests arrive.