The food is pretty much middle American. There are a few ingredients that are Idaho specialties, like Idaho Rainbow Trout, and of course the Famous Potatoes. In a similar vein, Moscow proclaims itself the "Dried Pea and Lentil Capitol of the World,". In the college towns Moscow, Boise, Pocatello, Idaho Falls, it's pretty easy to find organic and vegetarian food, but in the rural areas you might have a hard time finding a meal without beef.
In much of Idaho, particularly the southern portions, a popular condiment is "fry sauce", a combination of ketchup and mayonnaise. Fry sauce is primarily a Utah condiment but it is also popular in nearby areas, especially those with significant Mormon populations.
