The Aztecs did not have cows, sheep, or goats. They grew chili peppers, corn, tomatoes, beans, and squash on the floating gardens they built on the marshy waters. Their food was very spicy. They put chili into almost everything. They made stews and tortillas and stuffed flat breads. They sweetened their food with honey. They hunted ducks and turkeys and all kinds of water fowl and birds. They fished. They collected eggs and edible flowers. They ate insects, like grasshoppers, lizards, frogs, salamanders, and ants. They skimmed an algae off the lake that they made into something that tasted rather like cheese bread. They ate beans with nearly every meal as they understood that beans were good for you (beans are high in protein). The Aztecs made a chocolate drink out of the cocoa bean.
These foods were available to the rich. The poor, however, rarely ate much of anything except vegetables and grains.