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 let cool completely.
02 - In a large mixing bowl, whisk the cold mascarpone, heavy cream, sugar, lemon zest, lemon juice, and vanilla extract until smooth, thick, and holds soft peaks.
03 - Briefly dip each ladyfinger into the cooled lemon syrup 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 ladyfinger base using a spatula.
05 - Add a second layer of quickly dipped ladyfingers on top of the cream, then cover with the remaining lemon cream, smoothing the surface evenly.
06 - Cover tightly with plastic wrap and refrigerate for at least 4 hours, or overnight for optimal flavor and texture.
07 - Before serving, finish with a sprinkle of fresh lemon zest and optional white chocolate curls or mint leaves.