Have to agree with kageri, typically chin treats you try and minimize nutritional content cause it might knock their system out of balance, so you'd want to give something with less caloric content than a raisin. Making it a bit pointless to cook something that INCLUDES fruit, cause you'd have to separate out the components before giving to your chin anyhow.
Chins love chewing on anything, my chin loves his wood and even lava rock. (it's not flavoured). Anything with the slightest bit of flavour is like super bonus to them.
I like rose hips, personally.