Not cooking for them but some of the revolting things I find myself chopping up for them (they're on Barf). I think the worst was the first time I bought a rabbit home from the butcher last Autumn and was thinking "ooh great, all the innards as well, that'll make a couple of nice offal meals for them", and then found myself holding something the size of the end of my thumb and quite hard, and wondered what it was. Then I realised - it was the poor bunny's cold heart...
I used to have a couple of dwarf house rabbits years back and couldn't help thinking of them.
Still, the dogs enjoyed it - half each for a snack