01 - Whip heavy cream with powdered sugar and vanilla extract in mixing bowl until stiff peaks form. Set aside for assembly.
02 - Toss blueberries with granulated sugar if desired. Let macerate for 10 minutes to enhance sweetness.
03 - Arrange half of cake cubes in even layer across bottom of trifle dish or glass bowl.
04 - Spread half of lemon curd evenly over cake cubes using back of spoon.
05 - Scatter half of blueberries over lemon curd layer.
06 - Spread half of whipped cream over blueberries in smooth layer.
07 - Build remaining layers in same order: cake, lemon curd, blueberries, whipped cream.
08 - Sprinkle lemon zest over top and arrange extra blueberries for visual appeal.
09 - Refrigerate for at least 1 hour before serving to allow flavors to meld and texture to set.