A Crucible of Endurance
The quest is unlocked after completing The Great Plateau scenario.
"To toughen himself up, Yunobo is going to do the most intense training he can think of—eat stuff that will heat him up and then climb onto a burning hot slab! Get him food with warming properties."
"Heating the body inside and out... Talk about a trial by fire! After the training was complete, Yunobo rewarded his own gutsiness by chomping down the slab where he had grilled himself."
- Yunobo: Bonus Combo