Chicken Liver! When my Tiger had his "sex change oper." he wouldn't eat at all for days and the vet was really worried about him. They even put him on tube feeding. He spend all day at the vets and then I'd get off work bring him home and try to feed him there. So I finally bought him chicken livers and got him to eat, slowly but he ate it.

I hope you find something soon. Fingers crossed.