01 - Whisk together hoisin sauce, honey, soy sauce, oyster sauce, Shaoxing wine, brown sugar, five-spice powder, fermented bean curd if using, garlic, ginger, sesame oil, and white pepper in a large bowl until smooth and fully combined.
02 - Add chicken thighs to the marinade, turning to coat each piece thoroughly. Cover bowl and refrigerate for at least 2 hours, preferably overnight for maximum flavor penetration.
03 - Preheat grill to medium-high heat. Alternatively, preheat oven to 425°F and prepare a baking tray lined with foil and fitted with a wire rack.
04 - Remove chicken from marinade, allowing excess liquid to drip off. Reserve leftover marinade for basting during cooking.
05 - Grill chicken for 5 to 7 minutes per side, basting occasionally with reserved marinade, until caramelized and cooked through to an internal temperature of 165°F. For oven method, roast on rack for 20 to 25 minutes, turning and basting halfway through.
06 - Mix honey with hot water to create basting glaze. Brush over chicken during the final 2 minutes of cooking to achieve sticky, glossy finish.
07 - Let chicken rest for 5 minutes before slicing against the grain. Serve immediately while hot.