01 - Preheat oven to 350°F (180°C). Grease and line two 8-inch (20 cm) round cake pans with parchment paper.
02 - Beat eggs, granulated sugar, and salt on high speed with an electric mixer for 5–7 minutes until pale, thick, and tripled in volume.
03 - Gently fold in the all-purpose flour and vanilla extract using a spatula without deflating the batter.
04 - Divide the batter evenly into prepared pans. Bake for 20–25 minutes until golden and the cakes spring back when lightly pressed.
05 - Let cakes cool in pans for 10 minutes, then turn out onto a wire rack to cool completely.
06 - Whip cold heavy cream, powdered sugar, and vanilla extract together until soft peaks form.
07 - If desired, spread a thin layer of strawberry jam over one cooled cake layer.
08 - Spread half the whipped cream over the base layer and top with half of the sliced strawberries.
09 - Place the second sponge on top. Spread remaining cream over the top and arrange the remaining strawberries.
10 - Garnish with fresh mint leaves if desired. Chill for at least 30 minutes before slicing.