The eleventh book of Numbers talks about the complaints of the people. The Israelites were upset that all they had to eat was manna, while back in Egypt when they were still slaves, they had different types of food.

In Numbers 11:4-9, it is written:

“ The rabble with them began to crave other food, and again the Israelites started wailing and said, “If only we had meat to eat! We remember the fish we ate in Egypt at no cost—also the cucumbers, melons, leeks, onions and garlic.  But now we have lost our appetite; we never see anything but this manna!” The manna was like coriander seed and looked like resin.  The people went around gathering it, and then ground it in a hand mill or crushed it in a mortar. They cooked it in a pot or made it into loaves. And it tasted like something made with olive oil. When the dew settled on the camp at night, the manna also came down.”

It is evident in the passage above that the people were not satisfied with the food being freely given to them by God, who delivered them from their slavery in Egypt.