Preparation
Beat the egg yolks in a heatproof bowl with the sugar and vanilla sugar, using a hand whisk, until frothy.
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Bring the milk to the boil then pour through a sieve onto the egg mixture, whisking constantly.
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Set the bowl over a pan of warm simmering water and whisk until thick and creamy.
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The mixture is ready when a finger drawn through the mixture on the spoon leaves a clear gap.
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Set the bowl over iced water and whisk until cold.
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Whip the cream until stiff and fold it into the ice cream mixture.
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Rise a ring cake tin with cold water, empty and pour in the ice cream mixture. Freeze for at least 4 hours.
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For the chocolate sauce, bring the cream to the boil. Chop the chocolate and stir into the hot cream until melted.
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Dissolve the coffee in 4 tbsp hot water and fold into the chocolate sauce. Allow to cool.
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Briefly dip the cake tin in hot water and turn out the ice cream.
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Place a ring (slightly larger than the diameter of the cake tin) on a plate and fill with double cream. Pour some chocolate sauce around.
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Remove the ring and draw a decorative pattern with a cocktail stick or skewer. Place the ice cream cake in the middle and pour over the remaining chocolate sauce. Serve immediately.
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