I'm thinking maybe flourless, or close to. I see Nigella uses the whole orange (peel and all), but there aren't many reviews. Has anyone here tried it? I'm also considering something like the Craig Claiborne flourless cake from Maida Heatter's chocolate cookbook. It seems like I've made just about everything else in that book and can't figure out why I've missed that one. Her description is quite enticing.
Any others I should consider? I like the idea of some candied oranges for decoration, maybe some rind in the icing and/or orange oil in the cake. Just not sure about chopping the whole orange up in it.