This easy arugula spinach salad with quick pickled onions, fennel and olives is a delicious, vibrant salad with Mediterranean flavors. Peppery arugula and tender spinach pair with bright red, sweet pickled onions for so much flavor. It's finished with a classic homemade salad dressing of Dijon mustard and red wine vinegar. A fantastic green salad! (DF, GF, V)
