Heat a large sauté pot over medium-high and coat the bottom with a thin layer of oil. Sear the chicken in batches until deeply golden, then transfer to a plate.
Add the onions and cook until golden. Add the potato wedges and cook for a few minutes until lightly browned.
Stir in the date syrup and all the spices. Return the chicken to the pot and pour in enough water to reach the height of the chicken.
Cover and simmer until the chicken and potatoes are fully tender, about 1½ hours, stirring occasionally and adding water as needed to maintain a saucy consistency.