It's the last Cooking Issues of 2012! Tune in to hear Dave Arnold and Nastassia Lopez answer your cooking questions. Listen in to hear Dave offer advice about adding color to red velvet cake, and talk about the right reasons for going to culinary school.

This week on Cooking Issues, Dave Arnold and Nastassia Lopez take on listener questions of all sorts - from low-temperature cooking, to building a homemade circulator, to knife sharpening. What types of pumps are suitable for a good circulator? What is the best way to soak a liver?