I made this the other day,
http://themindfulfoodie.com/2012/04/25/potato-radish-leaves-curry-a-note-on-using-storing-fresh-produce/ Potato and radish leaf curry! It turned out really good! It wasn't spicy though. She says use chili powder, maybe she meant red cayenne? If I cook it again though, I'll still use the chili powder, and add some red pepper to give it a spicy kick. It was a great way to utilize a very tasty green that usually just gets thrown in the trash!