Fill the bottom pan of your double broiler with 1 inch of water and bring to a simmer. I use a small sauce pan and fit a glass measuring cup inside to makeshift a double broiler.

In the top bowl of your double broiler whisk together eggs, yolks, sugar, and lemon juice. Place butter in but do not yet stir.

Place top of double broiler over the bottom with the simmering water. Let mixture warm until the butter is melted stirring occasionally.

After the butter is melted you will need to stir continually for about 15 minutes until the curd has thickened. You will know it is thick enough if when you remove the spoon, it is coated with lemon curd.

Remove from heat and gently stir in lemon zest. Refrigerate for 3 hours before using.