We recently purchased 6 kohlrabi with their stems attached. We followed this simple recipe to repurpose the greens rather than discarding them: http://www.culinate.com/recipes/collections/Contributors/Ivy+Manning/Kohlrabi+Greens+with+Toasted+Sesame+Oil+and+Soy+Sauce. This was simple and delicious, requiring only soy sauce, sesame oil, and shichimi. Kohlrabi greens taste like a cross between spinach and collard greens. (Mar. 2016)
Cooking Adventures 