*You can make your own by blending in a blender or food processor granulated sugar until fine about 1-2 minutes. It should be like fine sand. Don't over blend.
Instructions
Place a pot with 1-2 inches of water (bain marie) on low/medium heat, in a bowl add the lemon juice and zest, egg, yolks and sugar, place the bowl over the pot of water and stir constantly with a whisk until thick*.
Remove the bowl from the heat and immediately stir in the cold butter until melted. Pour the curd through a sieve while still hot into a clean jar, pouring it through a sieve will make it silky smooth. Let cool then refrigerate if not using immediately. Enjoy!
*Once the mixture starts to foam it will thicken in about 10-12 minutes.