In a food processor fitted with steel blade, add lemon zest and sugar. Pulse until well combined and zest is finely minced with the sugar.
In a stand mixer fitted with paddle attachment, cream the butter. Beat in the sugar-zest mixture until combined. Add eggs, fresh lemon juice, and kosher salt. Mix until well combined, scraping down sides as needed.
Pour mixture into a medium saucepan and whisk constantly over low heat until thickened, about 10-15 minutes. Lemon curd will thicken just below the point of simmer. It will turn from a dark yellow liquid to a pale, thick syrup as you whisk.
Once lemon curd is nicely thickened and pale yellow, remove from heat. Allow to cool and chill completely. Store in airtight container in fridge.
Notes
Use fresh lemons. Freshly squeezed juice and zest give the curd its bright, clean flavor that bottled juice can’t match.
Zest before juicing. It’s much easier to zest whole lemons than ones that have already been squeezed.
Keep the heat low. Gentle heat prevents the eggs from curdling and helps the curd thicken smoothly.
Whisk constantly. Continuous whisking keeps the mixture silky and prevents lumps from forming.
Cool completely. Let the curd cool to room temperature before refrigerating so it sets evenly.
Storage: Keep lemon curd in an airtight container in the fridge for up to 2 weeks or freeze for up to 2 months.
Adjust sweetness. Taste as you go—add a little more sugar if you prefer a softer, sweeter flavor.
Repurpose leftovers. Spoon it over pancakes, swirl into yogurt, or use as a filling for cakes and tarts.
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