INGREDIENTS
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For the brownie
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250g unsalted butter, plus extra
to grease
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250g dark chocolate, roughly chopped
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300g light muscovado sugar
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5 large free-range eggs, separated
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For the chocolate meringue
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4 large free-range egg whites
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225g golden caster sugar
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2 tsp vanilla extract (we like Nielsen-Massey)
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1 tsp cornflour
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50g pure cocoa powder