1.Place couscous and 1/4 teaspoon salt in a heatproof bowl; cover with the boiling water and mix gently with a fork. Cover bowl with a lid or plastic wrap; stand for 10 minutes.
2.Fluff couscous with a fork. Stir in herbs, onion and capsicum.
3.Combine preserved lemon, juice, honey and oil in a jug or bowl; stir until well combined.
4.Pour dressing over couscous, season to taste with sea salt and freshly ground black pepper; toss gently. Top with lemon zest.