Carmen Devito and Alice Marcus Krieg are talking about the Columbian Exchange on this week's episode of We Dig Plants. But don't misconstrue this discussion as a celebration! On the phone is culinary horticulturist and historian Scott D.

What happens when Nastassia "The Hammer" Lopez is not in studio with Dave? He gets a chance to go on (and on) about espresso techniques and what makes lever machines different (and better) than pump machines.

On the first episode of Cooking Issues in 2011, Dave & Nastassia are reunited in the studio and there are many issues to be resolved. Dave fields questions about home carbonation, infusing vinegar, essential oils, differences between starches and the music behind the show.