01 - Preheat oven to 350°F. Line bottom of 9-inch springform pan with parchment paper.
02 - Beat egg yolks with half the sugar until pale and thick. Add melted butter and vanilla. In separate bowl, whisk egg whites and salt to soft peaks, gradually adding remaining sugar until stiff peaks form.
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 5 minutes. Puree raspberries with sugar and lemon juice, strain to remove seeds. Heat 1/3 of puree gently, add squeezed gelatin, stir until melted, then combine with remaining puree. Cool to room temperature.
06 - Whip cold heavy cream to soft peaks. Gently fold cooled raspberry mixture into whipped cream until smooth and uniform.
07 - Spread raspberry mousse evenly over cooled almond sponge while still in springform pan. Smooth top. Chill at least 4 hours until fully set.
08 - Remove cake from pan. Top with fresh raspberries, dust with powdered sugar, and garnish with mint leaves if desired.