Chop 1 clove of the the garlic, lemon and 1 tablespoon of parsley to make a rough paste. Set aside.
Mince remaining clove and mix with coriander, cumin, cinnamon, and pepper.
Heat oil over medium then add chicken and brown for 4 minutes. Set aside on a plate.
Again on medium, add onion and spices (not paste) and stir constantly for 2-3 minutes. Add tomatoes and lemon juice and scrape up the bits. Bring to a simmer then return chicken pieces and cook for 5 minutes.
Add zucchini, olives, remaining lemon zest and parsley.
Reduce heat to low, add paste, cook covered for 10 minutes until chicken is cooked through. Lightly season with salt and pepper.