Raspberry Fool??

I've got a vague recipe for it but no amounts for the ingredients. It's got custard and obviously raspberrys and i think jelly in it to make it set and you serve it with cream poured over it. I remember how good it was but its been years since i've made it and can't remember what to do.

Anybody got any ideas? Or does anyone have any nice simple ideas as to what to make for christmas day pudding. Something that can be made in advance