01 - Whip the heavy cream with powdered sugar and vanilla extract in a mixing bowl until stiff peaks form. Set aside.
02 - Toss fresh blueberries with granulated sugar if desired and let stand for 10 minutes to release natural juices.
03 - Arrange half of the cake cubes in an even layer across the bottom of a trifle dish or large glass bowl.
04 - Spread half of the lemon curd evenly over the cake cubes using a spoon or spatula.
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 - Repeat the layering sequence with remaining cake cubes, lemon curd, blueberries, and whipped cream.
08 - Sprinkle lemon zest over the top and add a few extra blueberries for garnish. Refrigerate for at least 1 hour before serving.