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Put the full egg, egg yolk (set white aside for later), sugar, lemon and butter in a pan and heat over a low heat until the butter has melted, keep stirring until starts to bubble and thicken.
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Remove from the heat and let the mix cool, it doesn't need to be fully cold but cool to the touch, I left it standing for about 30-40 mins.
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Whisk 200ml of the double cream in a jug or bowl with icing sugar until you get stiff peaks.
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Whisk the egg white until stiff peaks.
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Mix the lemon curd made in step one into the cream then fold in the egg white. Split into 6 glasses.
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Whisk the remaining 50ml of cream until stiff and place on top on the mousse. Allow to set fully in the fridge for at least 4 hours. Top with a wedge of lemon if you like!

