Zest the lemons and add to sugar. Stir to incorporate.
Separate the yolks from the whites.
Juice the lemons until you have 7 tbsp worth of lemon juice. Strain out any seeds.
Add the egg yolks to a pot and beat lightly with a wire whisk. Whisk in the lemon zest and sugar combination, and give it a good mix until lighter in color. Gradually add the lemon juice while stirring.
Heat on low, while stirring constantly with a wire whisk until mixture thickens, just starts to bubble and coats back of wooden spoon.
Remove pot from heat, then add the cold, cubed butter and mix until melted.
Optional: if you prefer a smoother texture, strain out the zest.
Transfer the curd to a sealable container or bowl. If storing in a bowl, make sure to cover the surface with plastic wrap to prevent a skin from forming.
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