Combine all the marinade ingredients and stir well
For the chicken
Cut the chicken thighs into large chunks (about 2x2" 5x5cm) and place in a bowl or bag.
Pour the marinade over the chicken pieces and stir to ensure everything is coated. Seal the bag or cover in plastic wrap and refrigerate for 24 hours. 1 hour at the very least, but the longer the better.
When marinated, thread the chicken pieces onto skewers (if you're using wooden skewers, be sure to soak them in water for a couple of hours first to avoid them disintegrating in the heat)Heat a BBQ grill or oven grill to hot and cook the chicken for about 6 mins per side until nicely charred. Use the melted butter to baste the chicken once or twice during cooking.