This dish is a vegetarian version of a stew from Afghanistan, Quince Stew or Qorma-e-Behi. It uses lentils in place of the non-vegetarian items. It is a perfect Winter dish, fragrant from the quinces, and comforting and warming. Deeply, deeply warming.
I often use soft chard or other greens in this dish in place of the spinach, it works just as well.