01 - Preheat oven to 350°F. Line a rimmed baking sheet (approximately 9x13 inches) with parchment paper.
02 - Beat eggs and sugar with an electric mixer on high speed until thick, pale, and tripled in volume, approximately 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 the prepared baking sheet. Bake for 10 to 12 minutes until lightly golden and springy to the touch. Allow to cool completely before proceeding.
04 - Toss diced mango with sugar and lime juice. Set aside to macerate while preparing other components.
05 - In a heatproof bowl, whisk together egg yolks, sugar, yuzu juice, and lemon zest. Place over a pot of gently simmering water, creating a double boiler. Whisk constantly until thickened, approximately 6 to 8 minutes. Remove from heat and whisk in butter until smooth. Cover and refrigerate to chill.
06 - Whip cold heavy cream, powdered sugar, and vanilla extract to medium-stiff peaks. Keep refrigerated until assembly.
07 - Using a round cutter measuring 2.5 to 3 inches in diameter, cut 12 discs from the cooled sponge cake.
08 - Place one sponge disc as the base. Pipe or spoon a layer of yuzu curd, top with mango filling, then pipe a layer of Chantilly cream. Add a second sponge disc on top. Repeat with remaining ingredients to create 6 mini cakes.
09 - 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.