Za'atar Chicken

45min · 4 servings Ingredients • 3 lemons • 1 whole chicken (2¾ lb/1.3kg), cut into legs, chicken thighs, and breasts with the wing-tips left on (or about 2 lb 2 oz/1 kg of chicken legs or breasts with the wing-tips left on), skin on, if you prefer - or use bone in chicken thighs • 2 onions, sliced in half, then each half cut into 3 wedges (2¾ cups/260g) • 2 heads of garlic, skin on, sliced in half, crosswise • 2 teaspoons sumac • ¾ teaspoon ground allspice • 4 tablespoons /25g za’atar seasoning • 6 tablespoons /90ml olive oil • ¾ cup plus 2 tablespoons /200 ml chicken stock or water • Salt and black pepper • ¼ cup/5g parsley, finely chopped • ¼ cup/30g sliced almonds, toasted (optional)