For the Marinade: 4 cloves garlic, minced ½ cup sliced green onions, white and green parts separated, divided 2 tablespoons packed dark brown sugar 2 tablespoons fresh thyme leaves, chopped 1 tablespoon minced habanero pepper 1 tablespoon cider vinegar 2 teaspoons minced fresh ginger root 2 teaspoons kosher salt 1 teaspoon freshly ground black pepper 1 teaspoon smoked paprika ½ teaspoon ground allspice 8 (5 ounce) bone-in, skin-on chicken thighs For the Rest: 3 tablespoons olive oil, divided 1 large yellow onion, diced…