It ruins the taste and makes them tough. They should be skewered or grilled in the oven. Five minutes is quite long enough for skewered shrimps. A lobster takes eleven minutes in the oven, and six minutes on a skewer in the embers. Use no condiments except butter, garlic and lemon.
Good food is always simple.
International chefs waste too much. Fidel's gastronomic interference is well known. Once, having brought an American couple some lamb cutlets and a leg of lamb, he barged into the kitchen and advised the lady of the house to fry them in bread crumbs. When she said she would prefer to barbecue them, he was stung to the quick and stormed off in a huff. Moreno Fraginals taught Fidel Castro at university.