The charming, acclaimed book about a cat who is teased for the food she brings for school lunch—and that launched the beloved series about Yoko—is about accepting and embracing our differences. Mmm, Yoko's mom has packed her favorite for lunch today--sushi! But her classmates don't think it looks quite so yummy. "Ick!" says one of the Franks. "It's seaweed!" They're not even impressed by…