Toast your sesame seeds. Place the seeds in a warm skillet and toss until they begin to brown and are slightly fragrant. Transfer them to a bowl and set aside.
Heat the sesame oil in the skillet over medium-high heat. Add your veggies (minus the scallions), sauteing until they begin to soften, 3 - 5 minutes. Feel free to throw in a dash of water to give the vegetables a little steam, this will speed up the cooking process. Once they are softened, add the grated ginger and sprinkle with salt and pepper. Saute together for 1 - 2 minutes.
Add the quinoa to the pan, along with the toasted sesame seeds, brown rice vinegar and tamari. Stir all together to mix the flavors. Just before you're ready to serve, gently fold in your scallions.