Pulse the garlic, onion, red pepper, cilantro, oregano, white vinegar, lime juice and red pepper flakes in a food processor (or can be made by hand in a mortar and pestle). Remove the mixture from the processor and pour it into a medium bowl. Whisk in the olive oil and adjust the seasoning with additional salt, pepper, vinegar and lime juice, to taste. Check the flavor by dipping a piece of bread into the sauce and tasting. Reserve half of the sauce for the marinade.
Clean and devein prawns. Hold a prawn in the palm of your hand keeping the shrimp straight and slide in the skewer from head to tail. Use 1 prawn per skewer.
Line 4 of the skewered prawns next to each other in a row. Draw an additional skewer perpendicular through the row, connecting the 4 skewered prawns together. Continue this step until all of the prawns have been skewered into groups of 4. Brush them with chimichurri and marinate for 2 hours.
Preheat an outdoor grill or an indoor grill pan.
Put the skewered shrimp on a grill and brush with more chimichurri. Flip the skewers and repeat. Cook until the prawns are opaque, about 5 minutes per side. Remove the skewers when the prawns are fully cooked.
Mix all the ingredients for the sriracha cocktail sauce in a bowl. Pour some of the sauce into shot glasses. Top with a prawn and garnish with a chive.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.