I feel the same way. I think it's a sin to waste food. If you met me you'd find it hard to believe I was a picky eater as a child.
My parents would do everything and anything, including threats, promises, bribes, blackmail, to get me to eat. My father tried psychology on me (you can probably guess now that it backfired). He'd say "there are so many starving children in the world who would love to have the food you're refusing". I'd say "well if I eat it they'll still be starving". That could not go unanswered and would invariably earn me a crack across the chops.
My nephews would push the envelope even further with my brother by saying "Yeah? Name one" when he'd use "There are so many starving children... ".
Beet greens, mustard greens, collard greens, turnip greens are all edible. I've had collard greens. They are strong and have to be blanched before cooking, and have to be heavily seasoned. So does broccoli rabe and kale. They're slightly bitter even after blanching.
Actually, all this is making me kind of hungry.
