In a saucepan, combine the heavy cream and sugar over medium heat.
Stir until the sugar dissolves completely.
Bring the cream to a gentle simmer, then remove from heat.
Allow the cream to cool slightly for about 5 minutes.
Add the fresh lemon juice and lemon zest to the cream mixture.
Stir well until fully combined.
Pour the mixture into serving cups or glasses.
Cover the cups with plastic wrap.
Refrigerate for at least 2 hours or until set.
Garnish with lemon slices and fresh mint leaves before serving.