01 - Preheat oven to 350°F. Line a rimmed baking sheet (approximately 9x13 inches) 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 sifted flour and salt into the egg mixture until just combined, being careful not to deflate the batter.
04 - Pour melted butter and vanilla extract into the batter, folding gently until fully incorporated.
05 - 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.
06 - Toss diced mango with granulated sugar and lime juice. Set aside to macerate while preparing other components.
07 - In a heatproof bowl, whisk together egg yolks, sugar, yuzu juice, and lemon zest until smooth.
08 - Place bowl over a pot of gently simmering water, creating a double boiler. Whisk constantly until mixture thickens considerably, about 6 to 8 minutes.
09 - Remove from heat and whisk in diced butter until completely smooth and emulsified. Cover and refrigerate until chilled.
10 - Whip cold heavy cream, powdered sugar, and vanilla extract together until medium-stiff peaks form. Keep refrigerated until assembly.
11 - Using a round cutter measuring 2.5 to 3 inches in diameter, cut 12 discs from the cooled sponge cake.
12 - Place one sponge disc as the foundation. Pipe or spread a layer of yuzu curd, arrange diced mango pieces on top, then pipe a layer of Chantilly cream.
13 - Add a second sponge disc and repeat layering process with remaining ingredients to create 6 mini cakes.
14 - Top each cake with extra mango, mint leaves, and edible flowers if desired. Refrigerate for at least 30 minutes before serving to allow flavors to meld.