In a saucepan, combine the heavy cream and sugar over medium heat.
Stir frequently until the sugar dissolves and the mixture begins to simmer.
Remove the pan from heat and let it cool slightly.
Add the lemon juice and zest, stirring well to combine.
Pour the mixture into individual serving cups or bowls.
Cover and refrigerate for at least 4 hours, or until set.
Once set, remove from the fridge and let it sit at room temperature for 10 minutes.
Garnish with fresh mint leaves and additional lemon slices if desired.
Serve chilled and enjoy this delightful dessert!
Store any leftovers covered in the refrigerator for up to 3 days.