This recipe is by Anupy Singla, whose cookbook, "The Indian Slow Cooker", is a publishing sensation. She says slow cookers are particularly suitable for Indian cooking, reminiscent of clay cookers that would have been used for village cooking. This recipe is a traditional and classic North Indian dish that you would find in every home, but not in restaurants. Comfort food for Punjabis, this is the dish her family requests the most.