I would like to see a show where the host takes you to the market/bakery/deli and tells you the differences between some items. Alton does this some, but make it so you learn about different cuts of meat, types of cheeses and breads, stocks vs broth, types of flour, wines .. the list could go on forever.
Have you ever seen the movie Mr. Mom where he goes grocery shopping and asks for ham, she starts listing all the different kinds so he changes to cheese, which of course there are even more types of.
Have them explain what they buy and why it's best for a certain recipe or meal. Then have them show what they make with the product of the day.