Prep & Melt Chocolate:
Preheat oven to 350°F (175°C).
Line a springform pan with parchment.
Melt dark chocolate gently in a double boiler. Stir in melted coconut oil until glossy.
Build the Base:
In a bowl, whisk egg yolks with sugar, citrus zests, vanilla, cardamom, and salt until creamy.
Stir in the chocolate–coconut oil mixture.
Whip Egg Whites:
In a clean bowl, whisk egg whites until soft peaks form.
Gently fold into the chocolate mixture in batches to keep airy.
Bake:
Pour batter into the pan and bake 30–35 minutes, until just set (slightly fudgy inside).
Cool at least 30 minutes before removing from pan.
Finish & Garnish:
Dust with cocoa powder or decorate with zest spirals, toasted coconut flakes, or flowers for a tropical–exotic flair.