01 - In a small saucepan, combine water, lemon juice, and sugar. Heat over medium heat, stirring continuously until the sugar fully dissolves. Remove from heat and allow to cool completely before using.
02 - In a large mixing bowl, whisk together the cold mascarpone, heavy cream, sugar, lemon zest, lemon juice, and vanilla extract until the mixture is smooth, thick, and holds soft peaks.
03 - Briefly dip each ladyfinger into the cooled lemon syrup, just a quick dip without soaking. Arrange a single layer of dipped ladyfingers in the bottom of an 8x8-inch dish.
04 - Spread half of the lemon cream evenly over the first layer of ladyfingers using a spatula.
05 - Dip the remaining ladyfingers in the lemon syrup and arrange them over the first cream layer.
06 - Spread the remaining lemon cream over the second layer of ladyfingers, smoothing the surface with a spatula to create an even finish.
07 - Cover the dish tightly with plastic wrap and refrigerate for at least 4 hours, or overnight for the best texture and flavor development.
08 - Before serving, garnish the top with fresh lemon zest and optional white chocolate curls or mint leaves. Serve chilled.