I've made lemon curd from my old, Martha Stewart cookbook and this one is very similar. I found it on Martha Stewart's website:
https://www.marthastewart.com/348239/lemon-curd. I think that when it comes to things like lemon curd, Martha knows her stuff. I'd guess that you might be able to half this recipe. It makes a lot of curd.
The other recipe I've made is from Joy of Cooking. I can't find that right now, but I'll look around. (BTW, Joy of Cooking's Lemon Bars Cockaigne recipe is absolutely the best.)
~ C