Strega Nona by Tomie dePaola

Strega Nona—"Grandma Witch"—is the source for potions, cures, magic, and comfort in her Calabrian town. Her magical everfull pasta pot is especially intriguing to hungry Big Anthony. He is supposed to look after her house and tend her garden but one day, when she goes over the mountain to visit Strega Amelia, Big Anthony recites the magic verse over the pasta pot, with disastrous results.