Put prawns or shrimp in a bowl and pour sauce over them, stirring to coat each piece well. Set aside to marinate (soak) for several hours.
Grilling over a charcoal fire is the preferred cooking method; broiling is an alternative. To broil, place whole prawns or shrimp on a rack over a pan that can catch drips. Put the rack about 3 inches from your broiler, and sear for 3-4minutes on each side. You can also cook them by frying quickly a in a skillet of hot butter until they become golden pink. ( To avoid scorching and smoking, use clarified butter)
Meanwhile, heat the marinade in which the prawns or shrimp were soaked. Pass at the table as sauce. If you prefer, make a fresh batch of piripiri for serving.
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