Prepare the Berries

1. Macerate Berries: In a medium bowl, combine the mixed berries, granulated sugar, and lemon juice. Gently toss to coat the berries and let them sit for about 10-15 minutes to release their juices.

Make the Cream Layer

1. Whip the Cream: In a large mixing bowl, whip the heavy cream until soft peaks form.
2. Combine Ingredients: In another bowl, mix the mascarpone cheese, powdered sugar, and vanilla extract until smooth.
3. Fold Together: Gently fold the whipped cream into the mascarpone mixture until fully combined and fluffy.

Assemble the Trifle

1. Layer Cake: In a large glass trifle dish or individual cups, add a layer of cake cubes at the bottom.
2. Soak Cake (optional): Drizzle the cake with berry juice or simple syrup if desired for added moisture.
3. Add Cream Layer: Spoon a layer of the mascarpone cream over the cake.
4. Layer Berries: Add a layer of the macerated berries, spreading them evenly.
5. Repeat Layers: Continue layering with cake, cream, and berries until the dish is filled, finishing with a layer of cream on top.

Chill and Serve

1. Chill Trifle: Cover the trifle with plastic wrap and refrigerate for at least 2 hours to allow the flavors to meld.
2. Garnish: Before serving, top with fresh mint leaves and additional mixed berries for decoration.
3. Serve: Scoop the trifle into bowls or cups and enjoy your festive dessert!