In a saucepan (off the heat), add the eggs, sugar, and lemon juice.
Whisk until completely smooth then place the saucepan over medium-low heat.
Cook while whisking constantly until the curd thickens, about 5–7 minutes. It should coat the back of a spoon.
Remove from heat. Add the cold butter and the lemon zest, and whisk until fully melted and the curd is silky.
Pour into a clean jar and press a piece of cling film directly onto the surface. This will prevent the surface from crusting.Let cool slightly, then refrigerate.
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Notes
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