Dissolve the coffee in the measured boiling water and mix it with the brandy.
Combine the eggs and caster sugar in a large bowl and whisk together until thick and leaves a trail on the surface.
Put the mascarpone cheese in a bowl and stir in a little of the egg mixture. Fold in the rest, then fold in the whipped cream.
Layer the tiramisu with half the trifle sponges, half the coffee and brandy mixture, half the mascapone mixture, and half the plain chocolate.
Repeat the layers with the remaining ingredients, decorating the top with the remaining grated white and dark chocolate and a dusting of cocoa powder. Cover and chill for at least 4 hours before serving.
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