Peel 3 lemons using a carrot peeler, taking care to avoid the white pith. Place the zest in the food processor fitted with the steel blade. Then add the sugar and pulse until the sugar has been finely minced with the zest.
Add the sugar and lemon mixture to the butter and cream together. Add the eggs one at a time, followed by the lemon juice and salt. Combine all ingredients.
Pour the mixture into a two-quart saucepan and cook over low heat, stirring constantly, until thickened. In order for the lemon curd to thicken, it needs to reach around 170 degrees F, or about just below the simmering point. Cool or refrigerate after removing from the heat. Enjoy!