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Preheat grill to a medium high heat.
Whisk together mustard, vinegar, lemon juice, olive oil, garlic, pepper and salt in a small bowl. Combine this marinade with chicken pieces in a large plastic bag or bowl. Toss until chicken is full coated and refrigerate for two hours or longer (up to a day), turning pieces periodically.
Steam couscous according to package directions along with the zucchini and tomatoes.
Grill chicken until no pinkness is apparent and juices run clear, and then transfer to serving plate on top of couscous.
Heat broth and marinade in a small sauce pan and bring to a boil, then add garlic and reduce heat to a gentle boil for 5 minutes to kill an bacteria in the marinade.
Sauce may be slightly thickened with cornstarch or flour if desired.
Drizzle over chicken pieces, and then sprinkle with chopped parsley and lemon zest.
(Serves 6)
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