In a bowl combine all remaining ingredients and blitz with an immersion blender. Or add to blender and blitz until smooth. Pour sauce over chicken and toss to coat. Cover with lid and cook for 6 hours.
Preheat oven to broil. Place a baking rack on a parchment paper covered baking sheet. Line out chicken wings on rack. Place under broiler for 3 minutes on each side. Serve with a sprinkle of parsley on top, if desired.