Paaya is an Urdu word for goat trotters. This soup strengthens joints especially the spine, I am telling this based on personal experience in my family where my Mom used to make this soup everyday to my grand mother when she was recovering from bone and joint issues. My mother also prepared this for my post delivery recovery. Mutton bones produce more than enough oil for preparing this dish so we do not need to add any more oil. You don’t need to make this soup with trotters , You can use regular bones and few mutton pieces if you want.