To make the syrup, add the water, lemon juice and caster sugar to a pan. Stir together and place on a low heat. Stir gently every so often and remove from the heat once the sugar is dissolved. Allow to cool, and if using, mix in the limoncello
Make the cream filling by adding the mascarpone, double cream, icing sugar and vanilla extract into a large mixing bowl and combining with an electric whisk. You can also do this with a stand mixer. Mix until combined and thick, being careful not to over mix
One at a time, dip half of the sponge fingers for 1 second into the syrup, then arrange them in the dish in one layer. You can cut them if needed to fit
Cover the sponge fingers with half of the cream filling and smooth it out into an even layer. Spread half of the lemon curd over the top
Repeat the process for a second layer of syrup dipped sponge fingers, cream filling and lemon curd
Put the lemon tiramisu in the fridge for at least 4 hour to set
When ready to serve, you can optionally whip up the double cream with the icing sugar and vanilla extract and pipe or spread it over the tiramisu, then decorate with lemon zest
Store leftovers in the fridge for 3 days
Notes
I used a dish measuring 8 inches wide, 12 inches long and 2.5 inches deep for this recipe.
The limoncello is optional, so you can easily make this tiramisu alcohol free and suitable for kids and anyone avoiding alcohol.
Although I provide cup measurements, I highly recommend weighing your ingredients out using digital kitchen scales. It is the most accurate way to measure ingredients and will ensure the best results. Digital scales are very low cost and can be purchased for around £12 ($16.50).
For teaspoon (tsp) and tablespoon (tbsp) measurements, please use measuring spoons and not the type of spoons you eat with. Again this will ensure accuracy and provide the best results.