Flourless Chocolate Cake

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1. 1Step 1: Preheat the oven to 160ºC/320ºF/gas 3. Grease a 20cm springform cake tin with a little butter and line with greaseproof paper.
2. 2Step 2: Rest a medium heatproof bowl over a pan of simmering water on a medium-low heat. Break in the chocolate, roughly chop and add the butter, then allow to melt, stirring occasionally until smooth and glossy.
3. 3Step 3: Carefully remove the bowl from the heat, stir in the coffee and set aside to cool slightly.
4. 4Step 4: Separate the egg yolks and whites between two large bowls. Whisk the egg whites for 1 to 2 minutes, or until soft peaks form.
5. 5Step 5: Add the sugar to the yolks and beat for 7 minutes, or until pale. Sift in the cocoa powder and 1 pinch of sea salt, then gently fold through to combine.
6. 6Step 6: Stir in the melted chocolate mixture, then gently fold through the egg whites until smooth.
7. 7Step 7: Transfer to the prepared tin and place in the hot oven for around 1 hour, or until an inserted skewer comes out clean.
8. 8Step 8: Allow to cool completely on a wire cooling rack, then serve with a dusting of cocoa powder and fresh berries.