mixed up, confused, cooked
殽 centers on things being mixed together in a disordered way, leading to confusion. The 'cooked' sense is a specific application where ingredients are mixed and prepared.
殽 combines 肴 (side dish, food) and 殳 (a hand holding a weapon or tool). The exact historical development is uncertain, but it likely relates to mixing or preparing food, which extended to confusion or disorder.
The left side 肴 suggests food or a side dish, and the right side 殳 looks like a hand stirring. Imagine a cook mixing ingredients together so thoroughly that everything becomes confused and mixed up.
For コウ, picture a cook (コウ) in a messy kitchen, mixing up ingredients until everything is confused: cook -> コウ.