chicken drumsticks or thighs (c. 500g), bones included (skin is optional), large onion, finely chopped, garlic cloves, minced, fresh celery, finely chopped, carrots, roughly chopped, cooked chickpeas, drained and rinsed (c. 120 g if you are using dry chickpeas), cinnamon stick (can us whole stick as well), fine salt, black pepper, olive oil, butter (I used ghee instead of olive oil and butter), ground cinnamon (cassia)