Mix soy sauce, date syrup, ketchup, orange juice, olive oil, vinegar, Sriracha, garlic, turmeric, paprika, five-spice, pepper, and salt in a bowl.

Mix soy sauce, date syrup, ketchup, orange juice, olive oil, vinegar, Sriracha, garlic, turmeric, paprika, five-spice, pepper, and salt in a bowl.

Cut potatoes into wedges and slice onions.

Arrange potatoes, onions, and chicken on the grill. Cover with foil paper and cook chicken at 200°C (392°F) for 1 hour, then at 180°C (356°F) for 30 minutes.

For Caramelize Oranges In a pan, melt butter and caramelize orange halves until golden.

Serve grilled chicken with green onions, caramelized oranges, and vegetables.