In a large pot, combine 1 quart of water with the orange juice and lime juice, salt, smashed garlic, sugar, soy sauce, oregano, peppercorns, lemon halves and cumin and bring to a boil. Let the marinade cool to room temperature.
Add the chicken wings to the marinade, cover and refrigerate for 14 to 16 hours.
Light a grill. In a small bowl, combine the garlic salt with the black pepper and cayenne. Remove the chicken wings from the marinade and pat them dry with paper towels. Sprinkle the wings with the seasoning salt and grill over moderately high heat, turning often, until charred and cooked through, about 30 minutes.
Transfer the chicken wings to a serving platter and sprinkle with the scallions and cilantro. Serve the Molasses Barbecue Sauce at the table.