Answer:
They eat a typical Persian diet, which includes lots of fruits, nuts, legumes, and whole grains, vegetables, and lastly, fish, meats and dairy products. Rice and wheat are the most-used grains.
Wikipedia has a detailed description:
http://en.wikipedia.org/wiki/Iranian_cuisine
We also eat dishes such as gormeh sabsi (a stew with beef, beans, and herbs over a bed of rice), choresht (any stew typically made with eggplant, chicken, and a variety of other foods), and we eat different kinds of rice with practically all of our meals. Saffron is a spice that is typically used in Middle Eastern cooking but it is quite rare and expensive.