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