01 - Combine the sliced strawberries, granulated sugar, and lemon juice in a large bowl. Toss gently to coat and let sit for 15 to 20 minutes until the fruit releases its juices and becomes syrupy.
02 - In a clean mixing bowl, beat the cold heavy cream with powdered sugar and vanilla extract using an electric mixer or hand whisk until soft peaks form. Do not overbeat.
03 - Arrange half of the cake cubes in an even layer at the bottom of a large glass trifle dish or clear serving bowl.
04 - Spoon half of the macerated strawberries and their accumulated juices evenly over the cake cubes, pressing down slightly.
05 - Spread half of the whipped cream smoothly over the strawberry layer using a spatula.
06 - Repeat the layering process with the remaining cake cubes, strawberries with juices, and whipped cream, finishing with a cream layer on top.
07 - Garnish the top with reserved fresh strawberry slices or mint leaves if desired. Refrigerate for at least 30 minutes before serving to allow flavors to meld and textures to set.