"This German 20-layer cake is cooked under the grill with the most watchful of eyes - namely, Paul Hollywood's!..."
INGREDIENTS
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10 large free-range eggs, separated
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100g/3Â 1/2oz unsalted butter
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150g/5Â 1/2oz caster sugar
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1 large lemon, zest only
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1 tsp vanilla bean paste
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150g/5Â 1/2oz plain flour, sifted
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65g/2Â 1/4oz cornflour, sifted
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oil, for greasing
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6 tbsp apricot jam
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50g/1Â 3/4oz unsalted butter
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1 tbsp golden syrup
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1 tbsp rum
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1 tsp vanilla bean paste
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75g/2Â 1/2oz plain chocolate (36% cocoa solids), finely chopped
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250g/9oz icing sugar
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1 tbsp rum
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 1/2 tsp vanilla bean paste
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1-2 tbsp milk