Creating the Strawberry Lemon Trifle can be straightforward if you follow these clear steps:

1. Prepare the Strawberries: In a medium bowl, combine sliced strawberries, lemon juice, and 1/4 cup of sugar. Toss gently and set aside to macerate for about 15-20 minutes.

2. Make the Lemon Cream: In a large mixing bowl, beat the heavy cream until soft peaks form. Gradually add the remaining sugar, lemon zest, and vanilla extract. Continue to beat until stiff peaks form.

3. Fold in Mascarpone: Gently fold the mascarpone cheese into the whipped cream mixture until fully blended and smooth.

4. Layer the Ingredients: In a large glass trifle dish or individual glasses, begin layering:
– Start with a layer of sponge cake pieces.
– Add a layer of the lemon cream mixture.
– Spoon in a layer of the macerated strawberries.
– Repeat the layers until you reach the top, ending with a layer of lemon cream.

5. Chill: Cover the trifle with plastic wrap and refrigerate for at least 2 hours to allow the flavors to meld.

6. Garnish: Before serving, decorate the top with additional fresh strawberries and mint leaves if desired.