The day after the Passover, on that very day, they ate unleavened bread and roasted grain from the produce of the land.

Numbers 15:19
and you eat the food of the land, you shall lift up an offering to the LORD.

Joshua 5:10
On the evening of the fourteenth day of the month, while the Israelites were camped at Gilgal on the plains of Jericho, they kept the Passover.

Joshua 5:12
And the day after they had eaten from the produce of the land, the manna ceased. There was no more manna for the Israelites, so that year they began to eat the crops of the land of Canaan.

And they did eat of the old corn of the land on the morrow after the passover, unleavened cakes, and parched corn in the selfsame day.