crust (n)

The little boy never ate the crust of his pizza.
She preferred her toast with a thick layer of butter spread on the crust.
The artisanal bakery prided itself on baking bread with a perfectly crunchy crust.
He always left the crust of his sandwich untouched, much to the annoyance of his mother.
The crust of the freshly baked baguette had a delightful golden brown color and a satisfying crunch.