Preheat oven to 350°F (175°C).
Line a baking pan with parchment paper.
Beat eggs and sugar until thick and pale.
Fold in sifted flour and salt.
Add vanilla, lemon zest, and melted butter.
Mix gently until smooth.
Spread batter evenly.
Bake for 15–18 minutes.
Allow to cool completely.
Cut rounds to fit your mini cake molds.
Blend strawberries until smooth.
Strain through a fine sieve.
Stir in sugar and lemon juice.
Heat gently until sugar dissolves.
Sprinkle gelatin over cold water.
Let stand for 5 minutes.
Heat gently until dissolved.
Mix into the strawberry puree.
Cool to room temperature.
Whip the heavy cream to soft peaks.
Fold the cooled strawberry mixture into the whipped cream.
Mix until smooth and fluffy.
Place sponge rounds into the bottoms of the molds.
Fill molds with strawberry mousse.
Smooth the tops.
Refrigerate for 3–4 hours until firm.
Blend strawberries with sugar.
Heat until sugar dissolves.
Stir in dissolved gelatin.
Cool slightly.
Pour a thin layer over each chilled cake.
Refrigerate for another 30–60 minutes.
Carefully remove cakes from the molds.
Top with fresh strawberries.
Add blueberries.and Garnish with mint leaves.
Finish with a small lemon slice or lemon zest and Dust lightly with powdered sugar if desired.