The Blend: Place the orange juice, lime juice, soy sauce, olive oil, ginger, garlic, pepper, cilantro, and green onions into a blender. Pulse until the mixture is well-emulsified and the aromatics are finely processed.
The Soak: Place the chicken thighs in a large bowl or heavy-duty zip-top bag and pour the blended marinade over them. Ensure the chicken is fully coated, specifically getting the marinade under the skin where possible. Refrigerate for 2 to 4 hours.
The Setup: Preheat your Big Green Egg to 350°F. Set up for Raised Direct cooking using the Eggspander system (top rack), a tiered grate, or the "legs down" ConvEGGtor hack to get the chicken high in the dome.
The First Half: Place the chicken on the raised grate skin-side up. Close the dome and cook for 35–40 minutes. The rendering fat will drip onto the coals, creating a savory "flavor smoke."
The Flip: Once the internal temperature reaches about 150°F, flip the thighs skin-side down. Watch closely for 10–15 minutes as the citrus sugars caramelize. You want a deep mahogany color without burning the skin.
The Finish: Use a Thermapen to check for an internal temperature of 175°F to 185°F.
The Rest: Remove from the Egg and let the chicken rest on a platter for 10 minutes before serving. Garnish with extra cilantro, sesame seeds, and lime wedges.