01 - Preheat oven to 350°F. Line a rimmed baking sheet (approximately 9x13 inches) with parchment paper.
02 - Beat eggs and sugar with electric mixer on high speed until thick, pale, and tripled in volume, about 5 minutes. Gently fold in sifted flour and salt until just combined. Pour in melted butter and vanilla, folding gently to incorporate.
03 - Spread batter evenly onto prepared baking sheet. Bake for 10-12 minutes until lightly golden and springy to touch. Cool completely before assembling.
04 - Toss diced mango with sugar and lime juice. Set aside to macerate while preparing other components.
05 - Whisk together yolks, sugar, yuzu juice, and lemon zest in heatproof bowl. Place over pot of gently simmering water, whisking constantly until thickened, about 6-8 minutes. Remove from heat and whisk in butter until smooth. Cover and refrigerate until chilled.
06 - Whip cold cream, powdered sugar, and vanilla to medium-stiff peaks. Keep chilled until assembly.
07 - Using round cutter (2.5-3 inches diameter), cut 12 discs from cooled sponge cake.
08 - Place one sponge disc as base. Pipe or spoon layer of yuzu curd, top with mango filling, then pipe layer of Chantilly cream. Add second sponge disc on top. Repeat with remaining ingredients to create 6 mini cakes.
09 - Garnish each cake with extra mango, mint leaves, and edible flowers if desired. Refrigerate at least 30 minutes before serving to allow flavors to meld.