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Ingredients:

120 ml (1/2 cup) white vinegar    
60 ml (1/4 cup) water    
1/8 teaspoon freshly ground pepper
1 tablespoon finely minced garlic    
fish sauce or salt to taste    
500 gm(approx 1 lb) large fresh shrimps, unshelled
700 ml (24 fl oz) coconut milk        


Method:

In a medium-size pot, prepare the marinade (vinegar, water, pepper, garlic and fish sauce or salt). 
Add shrimps and let stand for 1 hour. 
Cook in the same pot with the lid off, turning the shrimps often, until the pot is almost dry. 
Stir in the coconut milk and allow the sauce to thicken. (about 20 minutes.)