The Search For Delicious by Natalie Babbitt Book

Natalie Babbit’s memorable first novel, The Search for Delicious, about a boy who nearly causes a civil war in the kingdom all because of his work on the royal dictionary.
Gaylen, the King’s messenger, a skinny boy of twelve, is off to poll the kingdom, traveling from town to farmstead to town on his horse, Marrow. At first it is merely a question of disagreement at the royal castle over which food should stand for Delicious in the new dictionary. But soon it seems that the search for Delicious had better succeed if civil war is to be avoided.