Loved this!!  Super easy and incredibly delicious!  The oyster mushrooms were perfect - would chop them even less next time (like having the bigger chunks in there); omitted the dulse flakes because I didn't have them, but didn't miss them.  Used fresh chopped tomato because that's what I had, but a full can of chopped tomatoes would be great and likely make for thicker stew.  Serving over rice was lovely - farro would also be great.