|Just delivered to a lunch buffet for a regular client - lucky people!|
I found you probably only need to fill the oranges 1/3 of the way up. But this may be because I had made my own baking powder mix (had run out) so it was rather lively. They probably took longer to cook too (heat has to get through the orange skin before it can cook the cake inside).
It would be interesting to try it with limes and a white chocolate cake mix or a key lime cake mix.