I Started Journey to the West, and His Majesty Set Up a Firewood Pot. What Does That Mean?

After reading Journey to the West, Emperor Taizong of Tang Li Shimin never wanted to take another pill of immortality. Instead, he set up a wood-fired pot in front of Daming Palace and said to Tang Sanzang, "Royal younger brother, for the sake of the Tang Empire's everlasting glory, I'm afraid I'll have to apologize to you!"

This is a food story, with braising, steaming, deep-frying, and grilling... But surely one wood-fired pot isn't enough?