Conceptually or by taste? Most of the "local delicacy" samplings I've had traveling were more disgusting conceptually... you know, the brains, balls, bladders, etc of various animals.

By taste, it's a tie between a roasted guinea pig (tastes like you'd imagine a NYC rat to taste) and the weird slimeball in the last sip of my Starbucks coffee once. The latter still haunts me.