A "spinach dish" refers to any type of food or recipe that contains spinach as one of its main ingredients. It could be a salad, a cooked side dish, a soup, or something else entirely, but spinach is always a key component. Full definition
I had the best spinach dish at an Indian restaurant the other day... these spinach photos are definitely making me think about it again! (thewannabechef.net)
This is my mom's delicious and simple steamed spinach dish, and we made it just this week during her visit. (gnowfglins.com)