This recipe is delicious and loaded with nutritional value. This goes well with a roast, fish, pasta and can be eaten alone as a light meal with a nice crusty bread to soak up the juices. I made this up myself for a mushroom loving friend. The best spinach to use is the flat spinach, stems removed. Slice the portabellas into medium pieces, including the stems, which should be sliced separately. I use a lot of garlic, but that can be adjusted to taste. This recipe needs to be made quickly, so make sure all the ingredients are prepped in advance. Do not substitute red wine for the whte wine. If you don't have white wine, just make this without it.