Swap Option: Instead of the lemon curd filling, you could make a lime buttercream with lots of lime zest and juice. Technique Tip: If your lemon curd is too thin, you can easily thicken it by ...

Add the zest and juice of the lemon and lime and place over a medium heat. Continue to whisk until the mixture has boiled and thickened. Remove from the heat, add the caster sugar and egg yolks ...