Grilled Chicken With Za'atar

"Sesame seed, sumac, and herbs add flavor to a juicy roast chicken. [Photographs: J. Kenji Lopez-Alt] Extra-juicy butterflied grilled chicken gets a flavor-packed kick with a fresh homemade za'atar-style spice blend made with fresh and dried herbs, sesame seeds, and sumac. Sesame, sumac, and herbs meet chicken. Why This Recipe Works * A homemade mixture that combines dry and fresh herbs with sumac and sesame provides more flavor than a store-bought blend. * Butterflying the chicken before grilling allows you to cook both the breasts and the legs evenly while maximizing crispy skin. * Starting the chicken low and slow over indirect heat and finishing over the hotter side of the grill gives you the juiciest results. Notes: Store-bought pre-mixed za'atar can be used in place of the homemade version. Use 1/4 cup total. If using commercial za'atar, salt content will vary. Adjust according to taste. If you cannot find sumac, add 1 teaspoon grated lemon zest to the mixture in its place...."