Kale Radish Kimchi
Fermentation is a process that I found intriguing but intimidating, and it took several months before I gathered enough courage to begin trying it for myself.  First I read Michael Pollen's Cooked,  next was Sally Fallon's Nourishing Traditions, and then I dug even deeper in Sandor Katz's The Art of Fermentation.  Still, the idea of leaving food out at