This recipe is pretty basic, but feel free to add more to it. I can see adding mushrooms while the onions are cooking.Frozen spinach will work in a pinch, and baby spinach works well also.The batch I made for the photos show the stems and onions cut rather big, but if you prefer, trim the stems off and mince the onions so they are less visible in the dish. Another option is to add the onions to a food processor and pulse a few times. You can also pulse the spinach in a food processor to mince it as well.