Coconuts. Extremely healthy so I could survive off only it for a very long period of time. It provides liquid if I'm thirsty. I believe I could ferment the stuff to keep my spirits up. I can use it to manufacture oil for tons of uses, such as cooking, lighting, and replacing motor oil(in warm climates). It also serves as an excellent projectile.
Coconuts. Best food for survival you can ever get. There's only a few foods out there that are as good as coconuts and they're rather synthetic and while oyur body can adjust to that after a while you wouldn't need to go through the same thing as with coconuts.
EDIT: Damn, Rocketsurgeon beat me to the punch (lol)
I'd go with ginger. Because I hate ginger. That way I'd eat it so much that I'd eventually kinda like it, then like it, then love it before I get to the part of being tired of it. If I pick something I love I'd just end up being tired of it way faster.