1 cup couscous 1 (2-pound) whole red snapper, cleaned, head on 2 teaspoons salt, plus pinch for couscous 1/2 teaspoon freshly ground black pepper 1 small bunch fresh oregano 1 small bunch fresh parsley 1 whole lemon, thinly sliced 1 cup thinly sliced red onion 2 teaspoons minced garlic 1 cup halved grape tomatoes 1…