I have found that when Churtle turns up his nose and won't eat it, if I offer it again in a couple of weeks, he eats it like it is his favorite!
I wonder if the palm nuts were roasted if they would taste better?
I serve only raw vegetables, and have tasted most of them, and they are bitter, but I figure they would be raw if he was raiding someones vegetable garden, , so thats how I serve them.
I would just try offering new/old things he has refused, and see if he will eat them. Maybe offer him nuts that are shelled, cause maybe his wee little teeth can't get through a shell.