Food easily made in large quantities

The following kinds of food are easy to make in sufficient quantities to feed a large city or for trading. The only requirement is:

• fertile land (but roots can be grown on medium fertile terrain)
• enough labour
• enough culture

Through clever use of a city's specialty choice, you can create large quantities of one of these foods early in the game.

In addition to these foods, if you have a good source of wheat, you can also produce generous quantities of cheese and mutton without too much trouble.