Combine spice mix (hip cumin, coriander seed, fennel seed, cinnamon)
Preheat oven to 375°F. Rub chicken pieces with oil, a spice mix, ½ tsp spice mixture and salt. Place on a rack with the onion wedges. Bake for 25-45 minutes until fully cooked. Broil the cake to crisp.
Boil couscous per instructions - medium pot add onions, 2 ¾ cup chicken broth, 1 tbsp salt. Bring to boil, turn down to simmer and cover for 30 minutes.
In a frying pan, add butter, garlic, remaining spice mixture for 1-2 minutes. Add cooked couscous, 1 tsp salt, ½ cup cream. Stir and simmer 5 minutes to warm through.
Assemble: Add couscous and gravy to a serving platter. Top with roasted chicken. Serve with parsley and lemon wedges. Garnish with parsley and lemon wedges.