"This frosted walnut layer cake recipe appears as the technical challenge in the Cake episode of Season 3 of The Great British Baking Show. It is explained in further detail by Paul and Mary in Masterclass: Part 1...."
INGREDIENTS
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225g (8oz) self-raising flour, sifted
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1 tsp baking powder
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100g (3 1/2 oz) walnuts, finely chopped
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225g (8oz) butter, softened, plus extra for greasing
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225g (8oz) caster sugar
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4 large free-range eggs, beaten
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For the caramelized walnuts:
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100g (3 1/2 oz) caster sugar
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10 walnut halves
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For the buttercream:
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125g (4 1/2 oz) butter, softened
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1/2 tsp vanilla extract
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2 tbsp milk
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250g (9oz) icing sugar
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For the boiled icing
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2 large egg whites
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350g (12oz) caster sugar
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1/4 tsp cream of tartar