Menahot 57: Chametz (Leaven) on the Altar

In the context of cooking on Shabbat... when there is layering of meat on the coals, and then turn the meat over, one is liable for cooking on Shabbat. But not turning the meat over should also be an issue of cooking on Shabbat, depending on when the meat was put on the fire. Not turning the meat over leaves the meat substantially undercooked, but edible. Plus, the measure of this violation would be the amount of a dried fig. Also, no leavening was permitted in the grain-offerings, as per the Torah's description of them - even before the fistful is removed. With exceptions to the no-leaven rule, including the 2 loaves of Shavuot. But what happens if one processes a leavened grain-offering? Once it's been disqualified, can it be reinstated? Note that the constraints for this leavening question are not easily defined.