Place butter in cast iron skillet on the hot grill, once melted add onions and peppers. Once onions and peppers are caramelized, add other ingredients to skillet.
Grill shrimp for 30 seconds on each side and then add to your sauce mixture. Cook an additional 5-10 minutes until shrimp is done and sauce thickens. Garnish with parsley and green chopped green onions if desired. Serve over a bed of white rice with toasted French bread.
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