I made lemon Posset today after being given it at a friend's we had a meal with last Sunday.I made a small amount as a test run I'll double the quality for next time so will give that as the recipe
600mls double cream
150g caster sugar
2 tea spoons of vanilla extract (you could use a split pod if you want)
Juice of 2 lemons (80-90mls if using a bottled juice)
Bring the cream, sugar and vanilla to a boil and boil for 2-3 minutes, in a jug add the hot cream to the lemon juice and stir well, it will start to thicken.
Pour into 100ml ramekins, it's very rich so this is a good portion. Chill in the fridge until needed. It can be made in advance and just kept in the fridge if you have space and want to plan ahead.