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