Feel free to substitute other grains as desired. Quinoa, brown rice, farro, lentils, etc. will all work great!
Although I’ve given approximate amounts of each ingredient, please customize this salad to your liking. Want more walnuts or feta cheese? Go for it. Less parsley? Rock on. And I would suggest starting with a smaller amount of dressing, mix it in, and taste. Keep adding a little more, tasting along the way, until you reach that perfect balance.
You’ll probably have more roasted vegetables and grapes than you need. Refrigerate unused portion for up to several days and use for something else (mix in to some pasta one night, make some crostini, etc.).