In the trick at Mecone (535–544), a sacrificial meal marking the "settling of accounts" between mortals and immortals, Prometheus played a trick against Zeus. He placed two sacrificial offerings before the Olympian: a selection of beef hidden inside an ox's stomach (nourishment hidden inside a displeasing exterior), and the bull's bones wrapped completely in "glistening fat" (something inedible hidden inside a pleasing exterior). Zeus chose the latter, setting a precedent for future sacrifices (556–557). Henceforth, humans would keep that meat for themselves and burn the bones wrapped in fat as an offering to the gods. This angered Zeus, who hid fire from humans in retribution. In this version of the myth, the use of fire was already known to humans, but withdrawn by Zeus.