In a small bowl, sprinkle the gelatin over cold water and let it bloom for 5 minutes.
In a saucepan, combine cream, milk, sugar, and lemon zest. Heat gently until the sugar dissolves, but don’t let it boil.
Remove from heat and stir in the bloomed gelatin until completely dissolved.
Add fresh lemon juice and stir well.
Pour the mixture into serving glasses or ramekins. Refrigerate for at least 4 hours, or until set.
Garnish with blueberries and mint leaves before serving.