01 - Whisk together lemon juice, zest, sugar, and egg yolks in a small saucepan. Cook over medium-low heat, stirring constantly, until mixture thickens and coats the back of a spoon, approximately 5-7 minutes. Remove from heat and incorporate butter until smooth. Transfer to a bowl and cool completely.
02 - Combine blueberries, sugar, and lemon juice in a small saucepan. Cook over medium heat, stirring occasionally, until blueberries burst and sauce thickens slightly, about 5-7 minutes. Allow to cool completely.
03 - In a chilled mixing bowl, whip heavy cream with powdered sugar and vanilla extract until soft peaks form.
04 - Gently fold cooled lemon curd into whipped cream until fully incorporated and smooth.
05 - Distribute blueberry compote evenly among 4 serving glasses as the bottom layer. Top with lemon mousse. Repeat layering if preferred, finishing with mousse on top.
06 - Refrigerate assembled mousses for minimum 2 hours to set. Before serving, garnish with fresh blueberries, lemon zest, and mint leaves.