In a medium saucepan, combine the heavy cream and granulated sugar. Heat over medium heat, stirring occasionally, until the sugar has completely dissolved and the mixture is just about to boil. Do not let it boil.
Once the sugar is dissolved and the cream is hot, remove the saucepan from the heat. Stir in the fresh lemon juice, lemon zest, and a pinch of salt. Mix well until fully combined.
Allow the mixture to cool for about 10 minutes at room temperature.
Pour the cooled mixture into individual serving cups or ramekins.
Cover with plastic wrap and refrigerate for at least 4 hours, or until set. For best results, chill overnight.
Serve chilled, garnished with additional lemon zest or fresh berries if desired.