This is my "summer Tiramisu" The original recipe uses one packet of sponge fingers, but I use more to get more coverage on this size of tin. I also added the lemon zest and find it is not too tart, you can leave it out of course if you are not sure about it. You don't have to make this in a spring form pan, if you like to scoop it out of a dish, use whatever suits you. I sometimes use trifle sponges or plain cake instead of the sponge fingers. Oh... the lemons are low fat and very healthy!