Zest 1 of the lemons onto a small plate and set aside (this will be for decoration).
Zest the 2 remaining lemons and put into a large saucepan (save all of the lemon fruits for their juice).
Add the cream and sugar to the saucepan with the zest and warm over a medium heat, stirring gently.
Bring the cream to a boil, allow the cream to bubble for 1 minute and then remove the pan from the heat.
Now juice the saved lemons and mix into the cream mixture, stirring well to combine.
Pour into your individual glasses or ramekins. Carefully cover and pop into the fridge for minimum 2 hours or better, overnight.
Before serving, sprinkle over the reserved lemon zest.
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