My friend rashly promised to produce a cake for her sister's birthday but has now realised the implications of making a cake containing no identifiably cake ingredients. The cake has to be egg-free, gluten free, nut-free and dairy-free. I once had a kind of French chocolate log made with chestnut flour and cocoa- has anyone out there had anything like this? And if so do they have a a recipe? All ideas very happily received; my friend will be very grateful!