Cook quinoa in salted water per package directions. When cooked, spread on a baking sheet to cool.
Set grilling grid over clean grates and preheat for direct cooking over medium heat.
Grill the vegetables and when when cool enough to handle, cut into bite-size pieces; cut corn off the cob. Make the vinaigrette in a large mixing bowl and add the cooled quinoa and cut vegetables; toss to thoroughly coat. Add in the scallions, parsley, and cilantro and lightly toss to combine. Serve at room temperature or can be made up to 6 hours ahead; store covered in the refrigerator.
Gently toss before serving.
Recipe by Grilling Outdoor Recipes powered by Bull Outdoor Products at https://blog.bullbbq.com/red-quinoa-salad-with-grilled-vegetables/