INGREDIENTS
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A little softened butter, for greasing or use pan release
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285 g plain flour
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1 1/2 tsp baking powder
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200 g caster sugar
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4 eggs, separated
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1/4 tsp cream of tartar
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100 ml vegetable oil
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200 ml strong brewed black coffee
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pinch salt
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1 tsp vanilla paste or extract
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good-quality cocoa powder, for dusting
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250 ml double cream
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250 g mascarpone cheese
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90 g icing sugar