Warm cream, sugar, and salt in a saucepan over medium heat, stirring to dissolve.
Bring to a gentle simmer and cook 2 minutes, watching so it doesn’t boil over.
Remove from heat; stir in lemon zest. Let stand 5 minutes.
Whisk in lemon juice and vanilla until smooth and slightly thickened.
Strain into a measuring cup, then divide among six small ramekins.
Chill uncovered 20 minutes, then cover and refrigerate at least 3 hours until set.
Serve cold. Add berries or a shortbread cookie if you like.
Notes
Variation: Swap the lemon for a mix of lemon and lime, or infuse the cream with a strip of lemon peel and a sprig of thyme, then strain. Serving/Storage: Serve with fresh berries or a crisp cookie. Posset keeps well, covered and refrigerated, for up to 3 days.This recipe is an original creation inspired by classic Simple Lemon Posset Recipe flavors. All ingredient ratios and instructions are independently developed.