Trim and chop collard greens. Heat oil, add mustard seeds, stir and add chili, and dried ginger. After a few seconds, add onion and saute. Add collard greens and a pinch of salt, cook until wilted. Add a 1/2 cup of water, cover and cook for about 15 minutes on medium-low. Stir in garam masala, serve. Good over rice and/or with naan.