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, about 5 minutes.
03 - Gently fold in sifted flour and salt until just combined, being careful not to deflate the mixture.
04 - Pour in melted butter and vanilla extract, folding gently until fully incorporated.
05 - Spread batter evenly onto the prepared baking sheet. Bake for 10-12 minutes until lightly golden and springy to the touch. Allow to cool completely.
06 - Toss diced mango with granulated sugar and fresh lime juice. Set aside to macerate while preparing other components.
07 - In a heatproof bowl, whisk together egg yolks, granulated sugar, yuzu juice, and lemon zest until smooth.
08 - Place the bowl over a pot of gently simmering water to create a double boiler. Whisk constantly until thickened, approximately 6-8 minutes.
09 - Remove from heat and whisk in diced butter until smooth and glossy. Cover surface directly with plastic wrap and refrigerate until chilled.
10 - Beat chilled heavy cream, powdered sugar, and vanilla extract together until medium-stiff peaks form. Keep refrigerated until assembly.
11 - Using a round cutter measuring 2.5-3 inches in diameter, cut 12 discs from the cooled sponge cake.
12 - Place one sponge disc as the base. Pipe or spread a layer of yuzu curd, top with macerated mango pieces, then pipe a layer of Chantilly cream.
13 - Add a second sponge disc on top. Repeat with remaining ingredients to create 6 mini cakes total.
14 - Decorate each cake with extra diced mango, fresh mint leaves, and edible flowers if desired. Refrigerate for at least 30 minutes before serving.