Farmstands across New York City are starting to phase out summer produce to make way for the fall harvest, so you may be searching for what to do with all the eggplant, green beans and summer squash the markets have left.

This Friday at the Union Square Greenmarket, GrowNYC is hosting a free fermentation fest for the ins and outs of preserving foods for a new season.  

Sandor Katz is a James Beard Award-winning author, educator and a so-called "fermentation revivalist." Zaid Kurdieh co-owns Norwich Meadows Farm with his wife Haifa in upstate New York, which provides a lot of the fruits and vegetables that can be found at New York City farmstands. They joined WNYC host Michael Hill to preview Fermentation Fest.