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