Mussakhan (Roast Chicken With Sumac and Red Onions)

Name: Mussakhan (Roast Chicken With Sumac and Red Onions)
Cook time: 4 h
Total time: 4 h
Cuisine: Middle Eastern
Ingredients: 2 pounds bone-in, skin-on chicken thighs and drumsticks; 1 large lemon, juiced (about 4 tablespoons); 4 tablespoons extra-virgin olive oil, plus more for serving; 1 1/2 tablespoons sumac, plus more for serving; 4 garlic cloves, crushed; 1/2 teaspoon ground cumin; 1/2 teaspoon ground allspice; 1/4 teaspoon ground cinnamon; Sea salt and ground black pepper; 1 large red onion (about 1 pound), halved and thinly sliced; 2 tablespoons pine nuts; Naan or Arabic taboon bread, for serving; Coarsely chopped fresh parsley leaves, for serving