Deep within the nature of things, there are dualities: yin and yang, garden and gun, rain and shine, body and soul, to and fro, 1 and 0, being and nothingness, rock and roll, collards and kale.
Collards are flat-out, kale is frilly. Collards go with pig meat (or smoked turkey), kale with tahini. Kale is for people who want to get ahead in today’s skinny business world, and it makes a nice garnish.
