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 Fallout, Fallout 2, Fallout 3 and Fallout Tactics to replenish hit points.

Fallout 3
Iguana-on-a-stick is commonly found throughout the Capital Wasteland, in containers or being peddled by vendors.
 * Iguanas themselves are never actually seen in the game anywhere.
 * It is possible that the iguanas survived the blast as did the scorpions that were kept for pets as well, and have been thriving off the new increased temperatures, how exactly they get their food is difficult to explain.