“If half of an onion is black with rot, it is a rotten onion. A man is good, or he is evil.” (ACOK Davos II)
Sam found a place between Grenn and Orphan Oss, his stomach rumbling. The charred horsemeat dripped with grease as Craster’s wives turned the spits above the firepit, and the smell of it set his mouth to watering again, but that reminded him of Bannen. Hungry as he was, Sam knew he would retch if he so much as tried a bite. How could they eat the poor faithful garrons who had carried them so far? When Craster’s wives brought onions, he seized one eagerly. One side was black with rot, but he cut that part off with his dagger and ate the good half raw. (ASOS Samwell II)
Apples and Dragons 