01 - Combine water, granulated sugar, lemon juice, and zest in a small saucepan. Heat over medium heat, stirring continuously until sugar completely dissolves. Remove from heat and allow to cool completely before using.
02 - In a mixing bowl, whip cold heavy cream and powdered sugar using an electric mixer until stiff peaks form. Set aside.
03 - In a separate bowl, gently beat mascarpone cheese, vanilla extract, and lemon zest until smooth and creamy.
04 - Fold the whipped cream into the mascarpone mixture until fully incorporated and fluffy. Be gentle to maintain airiness.
05 - Quickly dip each ladyfinger into cooled lemon syrup, ensuring moistening without soaking. Work efficiently to prevent sogginess.
06 - Arrange half of dipped ladyfingers in single layer within 9x9-inch dish. Spread half of mascarpone cream evenly over cookies.
07 - Repeat with remaining ladyfingers and mascarpone cream. Smooth top surface with spatula for even presentation.
08 - Cover dish and refrigerate minimum 4 hours, preferably overnight, to allow flavors to meld and dessert to achieve proper consistency.
09 - Top with fresh lemon slices and additional zest before serving, if desired. Serve chilled.