Firstly put the pan on to a low heat to warm through.
Next whisk the egg whites until they stand up in soft peaks then in a jug add the lemon zest and lemon juice to the egg yolks, together with the sugar, and whisk until the mixture is creamy.
Now add the butter to the pan and turn the heat up to high then using a large metal kitchen spoon lightly and quickly fold the whites into the yolks.
As soon as the butter is foaming pour in half the mixture then add four generous teaspoons of lemon curd in little blobs all over, then spoon over the rest of the mixture and dust the surface generously with icing sugar and then quickly place the pan under the pre-heated grill until the surface is nicely golden brown.
Serve immediately straight from the pan with some chilled pouring cream.