Chocolate meringue cake

Method

1. Heat the oven to 170°C fan/gas 5. Line the cake tin with baking paper with a 3cm overhang all around.
2. Chop the butter and chocolate and put in a heatproof bowl over a pan of barely simmering water (ensuring the bowl doesn’t touch the water). Leave to melt, stirring a few times, then remove from the heat. Set aside to cool slightly.
3. Put 2 whole eggs, 4 eggs yolks (reserve the whites), the muscovado sugar and the vanilla in a large bowl. Using an electric whisk or the beater attachment on a stand mixer, beat for 4-5 minutes on a medium speed until the mixture is light and thick (when you lift out the beaters so they drop some of the mix across the top, the trail should be visible for 3 seconds or so). Gently pour the chocolate mixture in at one edge of the bowl, then carefully stir through.
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4. Sift in the ground almonds, salt and baking powder. Fold in very gently, being careful not to deflate the batter (use wide metal spoon and a figure-of-eight motion). Once all mixed in, scrape into the prepared cake tin. Bake for 28-30 minutes. Check the cake after 30 minutes with a toothpick – if the toothpick comes out with a just few crumbs, it’s ready. If there is still some liquid batter, bake for a few extra minutes. A slightly underbaked cake is better here as it will have extra baking time with the meringue. Set aside to cool in the tin for about 15 minutes.
5. Meanwhile, increase the oven temperature to 190°C fan/gas 7 and make the meringue topping for the cake. Put the reserved egg whites in a very clean heatproof bowl that will sit on top of a pan of water and add the caster sugar. Give it a stir, then place over a pan of barely simmering water (without the bowl touching the water). Stir occasionally until all the sugar has dissolved (check by rubbing a little between your fingers; when it’s ready it won’t feel grainy). This can take 5-7 minutes. If you have a thermometer, the temperature should reach 70°C.
6. Once ready, remove from the heat. Using the whisk attachment of a stand mixer or an electric whisk, beat at a medium speed for 3-5 minutes. Increase the speed and beat for a further 5-7 minutes, until the meringue is white, glossy and holding stiff peaks. Sift the cocoa powder on top, then gently fold in (as before) along with the cornflour and vinegar. Dollop this mixture over the slightly cooled cake, then bake for 18-20 minutes. It will puff and slightly collapse when it’s nearly ready – this is absolutely fine.
7. Remove from the oven and leave to cool in the tin for 15-20 minutes. Once cool, lift the cake carefully out of the tin, using the paper overhang. Dust with some extra cocoa powder. Cut into wedges and serve with dollops of whipped cream, plus blackberries and a sprinkle of edible flowers if you like. Store the cake in an airtight container at room temperature for 2 to 3 days – it tastes even better the next day!