01 - Preheat the oven to 400°F. Line two baking sheets with parchment paper.
02 - Lay the puff pastry sheets flat on the prepared baking sheets. Prick the surface evenly with a fork to prevent uneven rising. Place a second sheet of parchment over the pastry and set another baking sheet on top to weigh it down during baking.
03 - Bake for 15 to 18 minutes until the pastry is deep golden and crisp. Remove the top baking sheet and parchment layer, then allow the pastry to cool completely on the pan.
04 - While the pastry cools, combine the ricotta, powdered sugar, lemon zest, lemon juice, and vanilla extract in a medium bowl. Whisk until smooth and no lumps remain.
05 - In a separate chilled bowl, whip the heavy cream to soft peaks using an electric mixer or whisk. Gently fold the whipped cream into the lemon ricotta mixture in two additions until evenly combined. Refrigerate until ready to assemble.
06 - Once the pastry sheets are completely cool, carefully trim the edges to neaten. Cut each sheet into 3 equal rectangles, yielding 6 pastry layers total.
07 - Place one pastry rectangle on a serving plate. Spread one-third of the ricotta filling evenly over the surface. Add a second pastry layer and spread another third of the filling. Top with the final pastry rectangle.
08 - Dust the top generously with powdered sugar and garnish with lemon zest curls if desired. Refrigerate for at least 30 minutes before slicing to allow the layers to set. Serve chilled.