Grilled Chicken with Chimichurri

Combine 8 cups water, oranges, lemons, chiles, parsley, thyme, bay leaves, rosemary, garlic, salt, and peppercorns in a large stockpot. Bring to a boil over high. Cook, whisking occasionally, until salt dissolves and herbs are aromatic, about 2 minutes. Remove from heat; let cool completely, about 1 hour. Place chicken halves in mixture in stockpot. (Chicken should be fully submerged in liquid.) Cover and refrigerate 24 hours.

Process all chimichurri ingredients in a blender or food processor until smooth, about 1 minute, stopping to scrape down sides as needed. Store in refrigerator in an airtight container until ready to use, up to 8 hours.

Process all chimichurri ingredients in a blender or food processor until smooth, about 1 minute, stopping to scrape down sides as needed. Store in refrigerator in an airtight container until ready to use, up to 8 hours.

Stir together all spice blend ingredients in a small bowl until combined. Set aside.

Open bottom vent of a charcoal grill completely. Light 2 charcoal chimney starters filled with hardwood lump charcoal. When coals are hot, pour them evenly onto the 2 outer sides of grill, leaving center of grill unlit. Top each side of coals with an oak wood chunk. Adjust vents as needed to maintain an internal temperature of 300°F to 350°F. Coat top grate with oil; place on grill. (If using a gas grill, preheat to medium-low [300°F to 350°F] on outer burners, leaving middle burner[s] unlit.) Remove chicken from brine; discard brine, and pat chicken dry.

Place chicken, skin side up, on oiled grates over center portion of grill without coals (or unlit center portion of gas grill). Grill, uncovered, until a thermometer inserted in thickest portion of breasts registers 110°F, about 15 minutes, rotating chicken every 2 to 3 minutes to avoid burning. Flip chicken on grates; grill until skin is slightly caramelized and browned, about 3 minutes. Cover and grill until a thermometer inserted in thickest portion of breasts registers 150°F, about 25 minutes, flipping and rotating chicken every 5 minutes.

Sprinkle chicken all over with 2 tablespoons spice blend. Place chicken, skin side up, on grates. Grill, uncovered, until a thermometer inserted in thickest portion of breasts registers 155°F, 40 to 45 minutes. Remove chicken from grill, and cover loosely with aluminum foil. Let rest 15 minutes. Carve chicken. Sprinkle with additional spice blend to taste. Serve with chimichurri.