Saag is a generic term used for curried greens. This includes a variety of green leafy vegetables like Mustard Greens (Sarson), Fenugreek (Methi), Collard Greens, Spinach (called Palak in Hindi), and other similar varieties. Typically in northern India, Saag refers to a curried combination of spinach and mustard greens, whereas Palak refers to a spinach curry.