Ferdie is like this... to anything except MEAT.
His favorite treat is any form of chicken, beef, or fish scraps from the dinner table.
I've tried giving him different kinds of berries and vegetables, and every now and then he'll eat one, but usually he will say no to anything unless it's protein. The only time of plant he ever seems interested in is the grass outside, which he finds smells fascinating for some reason.
I found out today that he liked a piece of plain popcorn, of all things. :P I accidentally dropped a piece on the bed while I was eating some during our cuddle time and he snatched it up before I could look twice.