Lemon curd? I'm deeply disappointed. If I can't make it from the fruit then I won't make it at all. And yoghurt doesn't sound right for a fool either.BTW, on the subject of Fools, I go beyond the limited selection the supermarkets carry. In this season, for example, pears make a delicious Fool, especially with the addition of some root ginger. Into the depths of winter, Fool a parsnip or two, with the merest hint of nutmeg.