In celebration of 100 episodes of Responsa Radio, we're re-releasing our favorites with an update from Rav Eitan and Rav Avi at the end of the episode.

Our sound engineer, David Khabinsky's favorite is episode #78: A few months ago, one of the largest kosher certification agencies announced that it would not certify "Impossible Pork," despite the fact that nothing in the ingredients or preparation of Impossible Pork is not kosher. What determines whether or not a food is kosher, apart from the ingredients?