Here is the one for lemon curd: http://quitereasonable.blogspot.com/2014/01/lemon-curd.html
and here is the one for orange and lime curd: http://quitereasonable.blogspot.com/2014/03/orange-curd-and-lime.html.
I have a new favorite way and that is in the Vitamix. I started with their recipe here: https://www.vitamix.com/us/en_us/recipes/lemon-curd
But it wasn't near lemony enough and the color was bland.
So here is mine.
1 1/4 cups granulated sugar
2 egg yolks
1 cup fresh lemon juice (6-7 juicy lemons)
lemon zest from 3-5 lemons
1/2 cup unsalted butter cut in 16 pieces