01 - Whisk together orange juice, lemon juice, orange zest, lemon zest, granulated sugar, and eggs in a medium heatproof bowl until combined.
02 - Place bowl over saucepan of simmering water to create double boiler. Whisk constantly until mixture thickens and reaches 170°F, approximately 8-10 minutes.
03 - Remove from heat and whisk cubed butter into warm citrus mixture until fully incorporated and smooth. Allow to cool completely to room temperature.
04 - In separate chilled bowl, whip heavy cream until soft peaks form.
05 - Gently fold cooled citrus curd into whipped cream using spatula, being careful to maintain airiness until fully combined.
06 - Transfer mousse to serving glasses or ramekins. Refrigerate for minimum 2 hours until completely set.
07 - Whisk powdered sugar with lemon juice and orange juice until smooth and slightly thickened.
08 - Spoon thin layer of glaze over chilled mousse. Top with orange zest, lemon zest, and fresh mint leaves before serving.