The internet is an amazing tool. On searching for '3 yolk lemon curd' I lighted upon Martha's uber easy recipe, and as I hadn't a clue what a tablespoon of butter was in Olde Worlde measurements I found this page.
Ten minutes later it was cooling in the jar. And for the record I used the lemon juice that comes in a bottle. Oh, and I didn't have unsalted butter, I only had Welsh as I like a bit of salt myself. This gave it an unusual but not unpleasant taste. Maybe not for everyone.
As well as the madeleines I had been going to make friands, but someone had eaten the raspberries. Then I thought okay, chocolate brownies, but someone had eaten the chocolate. This sort of going-on makes me very cross and I have to admit I shouted a bit, even though no-one seemed in the least bit bothered. So we had a cocolate sponge to offer our guests, which seemed to do the trick.