Grilled Chicken with Nectarine BBQ Sauce

Heat the oil in a medium saucepan over medium heat until shimmering.

Add the onion, chipotle, garlic, and measured salt. Season with pepper and cook, stirring occasionally, until the onion has softened, about 5 minutes.

Add the ketchup and cook, stirring occasionally, until fragrant and slightly darkened in color, about 2 minutes.

Add the remaining ingredients, stir to combine, and cook until the mixture is bubbling around the edges, about 5 minutes.Reduce the heat to medium low and simmer, stirring occasionally, until the nectarines are completely softened and starting to fall apart, about 15 to 20 minutes.

Transfer the mixture to a blender.

Remove the chicken from the refrigerator and let it sit at room temperature for about 15 minutes. Meanwhile, heat an outdoor grill or grill pan to medium (about 350°F to 450°F).When the grill is ready, rub the grill grates with a towel dipped in vegetable oil.

Place the chicken on the grill (skin-side down if using skin-on), cover the grill, and cook until grill marks appear on the bottom, about 5 minutes. Flip the chicken pieces, cover the grill, and cook until grill marks appear on the second side, about 5 minutes more.Flip the chicken again and, using the bowl of sauce set aside for the chicken and nectarines, generously brush the chicken. Cover the grill and cook for 5 minutes. Flip and brush the chicken, and continue to flip and brush every 5 minutes (reserving about 1/3 cup of the sauce for the nectarines), until an instant-read thermometer inserted into the thickest chicken piece reads 160°F to 165°F and the meat near the bone is no longer pink, about 10 to 15 minutes more (about 25 to 30 minutes total cooking time).

Remove the chicken to a clean serving platter and cover loosely with foil; set aside.Scrape down the grill with a grill brush and oil the grates again.

Brush the nectarines all over with the remaining 1/3 cup of the sauce.

Place cut-side down on the grill, cover the grill, and cook until grill marks appear on the bottom, about 4 to 5 minutes. Using a flat spatula, flip the nectarines and cook until grill marks appear on the second side and the nectarines are slightly softened, about 4 to 5 minutes more.

Remove to the serving platter with the chicken and serve immediately, passing the reserved bowl of barbecue sauce.