Giant Maggots in Ancient Vietnam

I often come across this sort of thing in old Chinese books. There is plenty more where this came from.

The Sung Dynasty encyclopaedia T'ai p'ing yü lan, quotes the fourth century work Chiao chou chi 交州記 in chapter 860 under "Broth".

When T’ao Huang the governor of Chiu-chên was building the walls for the prefectural administration, in a hole in the earth he found a white thing shaped like a silkworm chrysalis which had no head, it was tens of chang (one chang = ten Chinese feet) long and tens of armspans around, and it squirmed. No one could name it, they cut open its belly and there was flesh like pig’s fat, so they made it into a broth and it was very tasty, Huang partook of a cup and his three forces of soldiers ate the whole thing up.

The original quote:

九真太守陶璜立郡築城於土穴中得一白色形似蠶蛹無頭長數十丈大餘圍軟軟動
莫能名剖腹有肉如猪肪遂以為臛羮甚香璜啖一杯三軍盡食 (TPYL chapter 860, 臛)