Pour the onion powder, garlic powder, smoked paprika, chilli powder and cracked black pepper into a zip lock bag and mix by shaking – add the drummettes and shake until all the chicken has been coated. Allow to marinate in the fridge overnight.
Heat char grill to a medium heat and lightly brush over the grill with a little oil to stop the chicken sticking.
Place the drumsticks on to the grill cook for one minute, turn drummettes over and turn heat down to low and cook for a further five minutes.
Into a small saucepan, add the Brown sugar, Apple vinegar and American mustard, place saucepan on char grill and whisk through until all ingredients have mixed evenly together.
Brush the drummettes with the baste mix and cook another two minutes before turning the drummettes, repeat baste and cook for a further two minutes. Serve.
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