Prepare the couscous according to package instructions.
Steam the broccoli until tender-crisp.
In a small bowl, whisk together the tahini, lemon juice, garlic, water, salt, and pepper to make the dressing.
Combine the cooked couscous and steamed broccoli in a large bowl.
Drizzle the tahini dressing over the salad and toss to coat.
Serve warm or at room temperature.
