This lemon sponge is light, airy and so moist because of the tangy lemon curd and creamy buttercream filling. A slice of this alongside a cup of tea and you are set for the rest of the day. This recipe was inspired by the lemon cake I was served by the nuns at Kylemore Abbey and it’s hard to beat!
225g caster sugar
4 large free range eggs
3tsp vanilla extract
225g self raising flour
zest & juice of 1 lemon
about 3 tablespoons of milk to loosen batter
For the buttercream
150g butter, softened
1/2 teaspoon vanilla extract (optional)
275g icing sugar, sifted
For the lemon curd filling
300g caster sugar
120ml lemon juice (about 2–3 lemons)
4 large egg yolks
a pinch of salt
finely grated zest of 2 lemon
60g (21/2 oz) Butter
Dusting of icing sugar
For the lemon curd, place the sugar, cornflour and 450ml water in a large saucepan and stir until you have a smooth mixture. Stir in the lemon juice, egg yolks and salt. Place over a medium heat and keep stirring while the mixture boils, for about 10–12 minutes. Stir in the lemon zest and butter until the butter has melted, then remove the pan from the heat and allow to cool.
Preheat the oven to 180°c the grease and line 2 21cm springform tins. In a standalone mixer, cream the butter, sugar and lemon zest together until pale and fluffy. Then beat in the eggs one by one before adding the vanilla extract and lemon juice. Using a spatula, fold in the flour until you have a smooth mixture. Use a little bit of the milk if you need to loosen the mixture. You want the mixture to be a bit loose.
Divide the mixture into the two springform tins, flatten the top with a spatula if needed. Bake in the oven for about 20 minutes, until it’s nice and golden. When the bases are cooked, take them out and let cool for a few minutes before you take it out of the tin to cool completely. While the bases are cooling prepare the buttercream filling by beating the butter and vanilla extract together in a bowl until light and fluffy then add the icing sugar, a little at a time, until it is all incorporated and the mixture is smooth.
To assemble the cake, spread some lemon curd on one of the bases before topping with buttercream, then add the second base and sprinkle with icing sugar.