Directions:

Preparation

Green tahini sauce Pulse garlic, parsley, tahini, lemon juice, and 1/2 cup water in a food processor, adding more water if needed, until smooth (sauce should be the consistency of a thin mayonnaise); season with salt.

Do ahead: Sauce can be made 1 day ahead. Cover and chill.

Chicken and assembly Preheat oven to 400°. Toss chicken, onions, garlic, lemon, sumac, allspice, cinnamon, broth, and 1/4 cup oil in a large resealable plastic bag; season with salt and pepper. Chill at least 2 hours.

Place chicken, onions, garlic, and lemon on a rimmed baking sheet, spooning any remaining marinade over and around chicken. Sprinkle with za'atar and roast until chicken is browned and cooked through, 45–55 minutes.

Meanwhile, melt butter in a small skillet over medium-high heat. Add pine nuts and cook, stirring often, until butter foams, then browns, and nuts are golden brown (be careful not to burn), about 4 minutes; season with salt.

Slice chicken breasts, if desired. Serve chicken with roasted onion and lemon, topped with pine nuts, with green tahini sauce and lavash.

Do ahead: Chicken can be marinated 1 day ahead. Keep chilled.