Mix the Greek yoghurt and the lemon curd with a spoon. It’s fine if there are small pieces of lemon curd in the mix.
Fill the Limoncello in a small bowl, add lemon juice & icing sugar and mix thoroughly. You may add more Limoncello or more lemon juice – just as you like it. Start with 2 tbsp of each for the basic mix.
Arrange a layer of sponge fingers on bottom of the casserole. Use about 2/3 of the sponge fingers.
With a basting brush add the Limoncello mess to the sponge fingers, but reserve some for the last layer to come.
Add the yoghurt mix and distribute it evenly all over the sponge finger layer.
Add 4 sponge fingers on top.
With a basting brush add the rest of the Limoncello mess to the sponge fingers.
Let it rest in the fridge for at least 1 h – better for 2 – 3 h.