01 - In a medium saucepan, combine the heavy cream and granulated sugar.
02 - Place over medium heat and stir gently until the sugar completely dissolves.
03 - Bring the mixture to a gentle boil, then reduce heat and simmer for 3 minutes, stirring occasionally to prevent overflow.
04 - Remove from heat and stir in the lemon zest and juice, mixing thoroughly to incorporate.
05 - Let cool for 5 minutes, then strain through a fine sieve into a pitcher if a smoother texture is preferred.
06 - Pour the mixture evenly into 4 small serving glasses or ramekins.
07 - Refrigerate for at least 3 hours or until completely firm and set.
08 - Top with fresh berries and mint leaves immediately before serving, if desired.