How to Make Lemon Curd
- Heat a double boiler to a low boil. Then reduce to a simmer.
- In top of double boiler or heatproof non-reactive bowl whisk together lemon juice. lemon zest, sugar, salt, and egg yolks. Whisk continuously while cooking until the mixture reaches 160 degrees fahrenheit and coats the back of a spoon; approximately 10-15 minutes.
- Remove from the heat and promptly add the butter. Whisk in quickly and thoroughly.
- Pour curd into a jar or bowl and cover with plastic wrap to avoid a skin. Once cooled remove the plastic wrap and refrigerate.