This is a favourite of Omar's Mum (Claire) from "Egyptian Cooking, A practical Guide".
A whole chicken (or chicken pieces if you prefer)
2 grated onions
5 garlic cloves (crushed)
1 tbp oregano finely chopped
1 tbp lemon juice
1 tbp oil
Mix marinade ingredients together. Put chicken in marinade, spreading around to ensure good coverage.
Leave to marinate for 3 hours.
If whole chicken either cook in spit or cur chicken in half and grill allowing 20 minutes each side.
If using chicken pieces, grill in oven or on BBQ as desired, basting with marinade 2 or 3 times.