Iguana-on-a-stick

Iguana-on-a-stick, available as a whole iguana or in the form of Iguana Bits, is an edible food item in the Fallout series eaten to replenish hit points.

Fallout, Fallout 2 and Fallout Tactics
 Iguana-on-a-stick It is sold by Iguana Bob in the Hub Downtown and available in many other places as well.

Fallout 3
Iguana-on-a-stick is commonly found throughout the Capital Wasteland. Dogmeat can be you're follower by giving him a Iguana-on-a-stick

Trivia

 * No living iguanas exist in any of the Fallout games(Big suprise).