Tabbouleh is a grain- and vegetable-based salad traditionally made with bulgur wheat. In this recipe, quinoa is first toasted to deepen its flavor, then cooked by the absorption method and combined with herbs and vegetables.
Toast quinoa in a 3-quart pot over medium-high heat, stirring frequently, until fragrant, 6 to 8 minutes. Add 1 1/2 cups water and 1 teaspoon salt; bring to a boil. Reduce heat to medium-low, cover, and simmer until grains are tender, about 15 to 16 minutes. Remove from heat and let stand, covered, 10 minutes, then fluff with a fork and let cool to room temperature.
Add herbs, lemon juice and zest, cucumber, tomato, and oil; mix thoroughly to combine. Serve chilled or at room temperature. Tabbouleh can be prepared up to 2 hours ahead and refrigerated, covered.