Toss the tomatoes, cucumbers, and lemon juice in a bowl with 2 teaspoons of the salt. Set aside.
Put the couscous into a large bowl. Bring the water, lemon zest, 3 tablespoons of the oil, the remaining salt, cayenne, and herb stems to a boil over high heat. Pour the liquid over the couscous, stir to separate any clumps. Cover with a lid, plate, or plastic wrap, set aside for 5 minutes. Remove the zest and herb stems and fluff with a fork.
Add the tomato mixture, scallions, mint, parsley, and pine nuts. Drizzle the remaining oil over the salad, toss and serve.
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