01 - In a large bowl, whisk together hoisin sauce, honey, soy sauce, oyster sauce, Shaoxing wine, brown sugar, sesame oil, five-spice powder, ginger, garlic, and food coloring if using. Whisk until the mixture is completely smooth and well combined.
02 - Add chicken thighs to the bowl with the marinade. Toss thoroughly to ensure each piece is evenly coated. Cover the bowl and refrigerate for at least 2 hours, preferably overnight for maximum flavor penetration.
03 - Preheat your oven to 425°F. Line a baking tray with aluminum foil and place a wire rack on top. This setup allows air circulation and catches drippings for easy cleanup.
04 - Remove chicken from the marinade, reserving the leftover liquid for basting. Place the chicken pieces on the wire rack, spacing them apart to ensure even cooking and proper air circulation around each piece.
05 - Roast the chicken for 20 minutes. The high heat will begin to develop the characteristic char siu caramelization.
06 - Remove the tray from the oven. Baste the chicken generously with the reserved marinade, flip each piece, and baste again. Return to the oven and roast for an additional 10-15 minutes, basting once more halfway through, until the edges are nicely caramelized and the chicken reaches an internal temperature of 165°F.
07 - Let the chicken rest for 5 minutes to allow the juices to redistribute. Slice against the grain and garnish with finely sliced spring onions and sesame seeds. Serve hot, at room temperature, or incorporate into your favorite dishes.