01 - Preheat oven to 400°F.
02 - In a large bowl, combine grated ginger, minced garlic, soy sauce, honey, olive oil, rice vinegar, black pepper, salt, coriander, and chili flakes. Whisk until well blended.
03 - Pat chicken thighs dry with paper towels. Add to the marinade and toss thoroughly to coat all pieces evenly. Let marinate for at least 15 minutes at room temperature, or refrigerate up to 4 hours for deeper flavor penetration.
04 - Arrange sliced onions and lemon slices across the bottom of a 9x13-inch baking dish to create a fragrant base layer.
05 - Place marinated chicken thighs skin-side up over the onion and lemon layer. Pour any remaining marinade evenly over the top.
06 - Bake uncovered for 40 to 45 minutes, until the skin is golden brown and juices run clear. The internal temperature should reach 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 rest for 5 minutes to allow juices to redistribute. Garnish with freshly chopped cilantro or parsley before serving.