In a large saucepan, bring the quinoa, water and 1/2 teaspoon salt to a boil. Reduce heat, cover and simmer 15 minutes. Remove from heat, keep covered and allow to steam another 10 minutes. Fluff quinoa with a spoon and cool completely. You can speed up the cooling process by spreading the quinoa out on a cookie sheet.
Place the cooled quinoa in a large bowl and add in the tomato, bell pepper, scallions and pine nuts. Toss to combine.
In a small bowl, whisk together the tahini, lemon juice, garlic-infused oil, 1/2 teaspoon salt, black pepper, and ground cumin. Add water, a teaspoon at a time, to thin dressing if needed. Pour over the the quinoa mixture and gently toss until the dressing is evenly distributed. Chill and serve on a bed or lettuce or greens if desired.