For the lemon curd
100g/3½oz butter, softened
225g/8oz caster sugar
5 free-range egg yolks
3 large lemons, juice and finely grated zest
300ml/10fl oz double cream, lightly whipped
To make the lemon curd, put the butter into a heatproof bowl, add the sugar and whisk by hand until combined. Stir in the egg yolks. Add the lemon zest and juice and whisk until smooth. Sit the bowl over a pan of just simmering water and whisk until the mixture has thickened. This will take about 8-10 minutes. Be careful the water does not boil as this will curdle the curd.