01 - Whip the heavy cream with powdered sugar and vanilla extract in a mixing bowl until stiff peaks form. Set aside.
02 - Toss blueberries with granulated sugar if desired and let sit for 10 minutes to release natural juices.
03 - Place half of the cake cubes in an even layer at the bottom of a trifle dish or large glass bowl.
04 - Spoon half of the lemon curd over the cake cubes and spread evenly.
05 - Distribute half of the blueberries over the lemon curd layer.
06 - Spread half of the whipped cream over the blueberries in an even layer.
07 - Layer the remaining cake cubes, lemon curd, blueberries, and whipped cream in the same order.
08 - Sprinkle lemon zest over the top and add a few extra fresh blueberries for decoration.
09 - Refrigerate for at least 1 hour before serving to allow flavors to meld and layers to set.