Saag, meaning greens, spinach in this case and aloo meaning potato is not a authenic Indian dish but very popular in the U.K.
This is a wonderful Indian dish made with chicken or shrimp. The result is a creamy gravy of spices, spinach and tomatoes. Serve over rice with naan or chapati and raita.
If you would like, the Masala can be prepared a day in advance and refridgerated.