What Is Lemon curd?
Lemon curd: A thick, tart, silky spread made by gently cooking lemon juice, zest, sugar, eggs and butter until it thickens.
In the kitchen
Curd is a cooked custard: eggs thicken as they are heated with the juice and sugar, and butter is whisked in for richness. It should coat the back of a spoon, and it thickens further as it cools.
The two things that go wrong are overheating, which scrambles the eggs, and overcooking, which makes it grainy. Cook over low heat or a double boiler, whisk constantly, and strain before chilling. Our troubleshooting guide covers how to rescue a curdled batch.
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