6/22/14: This week on "The Food Guys:" Greg reports on his recent trip to Florence, Italy, where he investigated (and sampled) high-quality extra-virgin olive oil, prosciutto, Tuscan pistachios, and other regional delicacies. Greg and Jon reveal why pine nuts grown in Italy and elsewhere have become so expensive: climate change.
More on pesto and pine nuts: "Don't Let the Price of Pine Nuts Keep You From Pesto," by Serri Graslie (All Things Considered," August 2013)