Zest the lemons, then juice them to obtain 1 cup of juice.
In a medium saucepan, whisk together the lemon juice, zest, sugar, and eggs.
Place the saucepan over medium heat and stir constantly.
Gradually add the cubed butter, continuing to stir.
Cook until the mixture thickens and coats the back of a spoon.
Remove from heat and strain through a fine-mesh sieve.
Let the lemon curd cool to room temperature.
Transfer to sterilized jars for storage.
Refrigerate and use within one week.
Enjoy your lemon curd on scones, pancakes, or desserts.