If I remember correctly the pea cake was a standard sponge mix but with peas added. Frozen or fresh? Not sure. Frozen would add to the water content of the cake, possibly disastrously. How green would the cake be? Could I pretend it's really pistachio?
Cooked fruit - I have to cook stoned fruit like plums, apricots etc as am allergic to raw. So fruity crumbles are yummy.
BUT: cream, custard or ice cream on top?