01 - Preheat the oven to 350°F. Line the bottom of a 9-inch springform pan with parchment paper.
02 - Beat the egg yolks with 1.75 oz sugar until pale and thick. Add the melted butter and vanilla, mixing gently.
03 - Whisk egg whites and salt to soft peaks. Gradually add remaining sugar and whip to stiff peaks.
04 - Fold the almond flour and all-purpose flour into the yolk mixture. Fold in one-third of the egg whites to loosen, then gently fold in remaining whites until just combined.
05 - Pour batter into prepared pan. Bake for 18-20 minutes until golden and toothpick comes out clean. Cool completely in pan.
06 - If using leaf gelatin, soak in cold water for 5 minutes. Puree raspberries with sugar and lemon juice; strain to remove seeds.
07 - Heat 1/3 of the puree gently. Add squeezed gelatin (or sprinkle powdered gelatin over and let bloom 5 minutes, then dissolve). Stir until fully melted, then combine with remaining puree. Cool to room temperature.
08 - Whip cold heavy cream to soft peaks. Gently fold cooled raspberry mixture into whipped cream until smooth and uniform.
09 - Spread raspberry mousse evenly over cooled almond sponge while still in springform pan. Smooth top. Chill at least 4 hours until fully set.
10 - Carefully remove cake from pan. Top with fresh raspberries, dust lightly with powdered sugar, and garnish with mint leaves if desired.