The fourth installment of our systematic breakdown of a cheeseburger deals with ketchup and pickles, two attempts to give vegetables the power to defy time.

This episode features a visit to The Pickle Guys as well as conversations with Andrew F. Smith of the New School University and the Edible series of books and the proprietors of First Field Ketchup.

This podcast is a co-production of the Sackler Institute for Nutrition Science and Science the City.