2. Combine all marinade ingredients in a small sauce pan. Bring to a simmer then remove from heat. Pour half of the mixture into a ramekin and leave remaining marinade in pan (You’ll brush on half now and brush on remaining marinade after shrimp are grilled).
3. Skewer 4 shrimp on each damp skewer without leaving spaces. Lay skewers flat on a rimmed Cookie Sheet. Brush one side of the skewered shrimp with sauce and refrigerate for 2 min until butter firms up. Flip shrimp over, brush second side and refrigerate 2 min until butter firms up.
4. Place skewers on the barbie and grill shrimp with the lid on about 2 minutes per side or just until cooked through and no longer transparent. Remove shrimp from grill. Don’t overcook or they will be rubbery. Brush on reserved sauce and serve.