Jamieson, Fausset and Brown on Joshua 5:11-12

11-12. And they did eat of the old corn of the land--found in storehouses of the inhabitants who had fled into Jericho.

parched corn--new grain (see on Le 23:10), probably lying in the fields. Roasted--a simple and primitive preparation, much liked in the East. This abundance of food led to the discontinuance of the manna; and the fact of its then ceasing, viewed in connection with its seasonable appearance in the barren wilderness, is a striking proof of its miraculous origin.