From Joe1979 :

Ever wonder how the ancient Romans fed their armies? What the pioneers cooked along the Oregon Trail? Who invented the potato chip...and why? So do we!!! Food history presents a fascinating buffet of popular lore and contradictory facts. Some experts say it's impossible to express this topic in exact timeline format. They are correct. Most foods are not invented; they evolve.

http://www.foodtimeline.org/index.html