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Preheat your oven to 160C (Gas Mark 3).
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Grease and line two smal cake tins.
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Beat the sugars and butter together until creamy.
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In a separate bowl, beat the eggs then add to the mixture a little at a time.
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Add the cooled coffee to the mixture and mix until combined.
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Sift in the flour and fold until it just comes together.
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Pour into the tins and pop into the oven for around 30 minutes.
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Check your cakes after the 30 minutes with a skewer, and when the skewer comes our clean, they're finished and can cool on a cake rack. If not, let them cook a little longer.
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Meantime pour the Guinness into a pan and put it on the heat.
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Split the vanilla pod and put it and the seeds into the pan (or simply add the extract).
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Stir in the malt extract and cook on the hob until it has reduced and is almost syrupy (15-20 mins).
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Cool.
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Once cooled, mix into the double cream, according to taste (this is where you may need the sugar syrup to balance it), and beat until soft peaks form.
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Spread between the two layers of cake, with a light grating of dark chocolate (optional).