01 - Preheat oven to 400°F. Position the rack in the center of the oven for even heat distribution.
02 - In a large mixing bowl, combine grated ginger, minced garlic, tamari soy sauce, honey, olive oil, rice vinegar, black pepper, sea salt, ground coriander, and red chili flakes. Whisk until thoroughly blended into a uniform marinade.
03 - Pat the chicken thighs dry with paper towels to ensure proper browning. Add the chicken to the marinade and toss to coat each piece evenly. Allow to marinate at room temperature for at least 15 minutes, or refrigerate up to 4 hours for more pronounced flavor.
04 - Arrange the sliced onion and lemon in an even layer across the bottom of a 9x13-inch baking dish. These will serve as an aromatic bed that infuses the chicken from beneath.
05 - Place the marinated chicken thighs skin-side up on top of the onion and lemon slices. Pour any remaining marinade over the chicken.
06 - Bake uncovered for 40 to 45 minutes until the skin is golden brown and juices run clear. The internal temperature should register 165°F at the thickest part of the thigh.
07 - For extra-crispy skin, switch the oven to broil on high for the final 2 to 3 minutes, watching closely to prevent burning.
08 - Remove from the oven and let the chicken rest for 5 minutes to allow juices to redistribute. Garnish with freshly chopped cilantro or parsley before serving.