I just came across a passage in
A Storm of Swords that seems relevant to this discussion:
When the flames were blazing nicely Meera put a fish on. At least it's not a meat pie. The Rat Cook had cooked the son of the Andal king in a big pie with onions, carrots, mushrooms, lots of pepper and salt, a rasher of bacon, and a dark red Dornish wine. Then he served him to his father, who praised the taste and had a second slice. Afterward the gods transformed the cook into a monstrous white rat who could only eat his own young. He had roamed the Nightfort ever since, devouring his children, but still his hunger was not sated. "It was not for murder that the gods cursed him," Old Nan said, "nor for serving the Andal king his son in a pie. A man has a right to vengeance. But he slew a guest beneath his roof, and that the gods cannot forgive."