Zest the lemon and put aside for garnish laterSeparately squeeze all of the juice out and set aside (you'll need about 4 tablespoons lemon juice)

Use 2 large bowls and separate the egg whites from the egg yolks

Whip the egg whites with an electric mixer on medium speed until stiff peaks form and set aside (don't overbeat!)

Add the powdered sugar to the egg yolks bowl and whip together using the electric mixerThen add the limoncello, lemon juice and mascarpone cheese. Whip again until you've reached a nice creamy mixture (don't overwhip!)

Pour the whipped egg whites into the cream bowl and using a rubber spatula gently fold the whites into the cream (do this slowly and fold through gently, don't overmix)

In a deep bowl, add the milk, limoncello and powdered sugar. Whisk until well combined

Using a large pyrex dish (13 x 9 inches / 30 x 22 cm) in size, one at a time, dip a savoiardi biscuit into the soaking mixture until fully submerged for 2-3 seconds at maximum. Place it into the pyrex dish on the edge of one side

Keep repeating the above step and place the soaked biscuits right next to each other in single layer. The biscuits should be covering the whole bottom of the dish, without any gaps. (If needed, break some biscuits in half to fit them in depending on your dish - refer to photos above in post)

Pour in just under half of the cream mixture straight on top of the biscuits. Using a spatula or the back of a spoon, gently smooth it out to an even layer so that all the biscuits are covered with a layer of cream

Dip the remaining biscuits one at a time into the soaking mixture. Place them in a single layer on top of the cream, ensuring they're all stuck together with no gaps

Pour the remaining cream on top, and using a spatula/back of a spoon, gently smooth it out to an even layer so all biscuits are covered

Garnish with grated white chocolate, grated lemon zest and cover with plastic wrap. Place in the fridge for at least 8 hours, or even better overnightWhen ready to serve, remove from the fridge and leave it out for 5 minutes. Slice into pieces and enjoy your delicious Limoncello Tiramisu!!!!