Canning, drying, freezing, storing...pickling...
Food Science & Technology
http://oregonstate.edu/dept/foodsci/foodweb/process_tech.htm
Chuno-Freezed dried potates that can be stored for long periods.
http://en.wikipedia.org/wiki/Chu%C3%B1o
Snack Foods
http://bmchips.com/
http://en.wikipedia.org/wiki/Snack_food
Ketchup
http://www.heinz.com/our-food/products/Ketchup.aspx
Soy Sauce
http://en.wikipedia.org/?title=Soy_sauce
http://en.wikipedia.org/wiki/Maize
http://en.wikipedia.org/wiki/Miso
TV dinners
http://en.wikipedia.org/wiki/TV_dinner
Canning:A History of Canning Food Reference
http://www.foodreference.com/html/artcanninghistory.html
http://www.answers.com/topic/history-of-food-production
http://en.wikipedia.org/wiki/Farm
The dirty tricks of food photographers
http://photocritic.org/food-photo-tricks/
Food Styling
http://www.foodportfolio.com/blog/food_photography/tricks_of_the_trade.html
Food labeling...