‘ And they ate of the produce of the land on the morrow after the passover, unleavened cakes and parched corn, on the selfsame day.'
That is they celebrated the Feast of Unleavened Bread the next day with unleavened cakes and parched or roasted corn which was the produce of the land. It was a day of triumph. The grain needed to make these cakes, and the corn, may have come from storeplaces in the plain of Jordan whose owners had taken shelter in Jericho. The amount was unimportant. It was the fact that mattered. The rules in Leviticus 23:10-14 would not apply because they had not reaped a harvest. They still also had the manna which did not cease until the next day.
“The produce (of the land).” The particular noun (‘avur) is only used here and in the next verse. It was used in this context probably because its consonants connect with the word for ‘cross over' (‘avar) referring to the crossing of the Jordan.
“The morrow after the passover.” This may be 15th or 16th Nisan, the former a Sabbath. But it does not say when the corn was collected. The womenfolk could have collected it from abandoned storeplaces while the men were recuperating.
We do not know whether the wheat harvests had been collected in by the Canaanites by this time. The ever-threatening presence of the Israelite army may well have hindered it so that it was only partly collected. And if it was fully collected much would have been available outside the city in the storehouses.