Prepare a large steamer basket lined with romaine, banana leaves or Napa cabbage. Top each oyster with ginger, scallions, a squirt of juice and black pepper. Steam hard for 3 to 5 minutes until the oysters are warm to hot in the middle. Meanwhile, heat the curry oil to very hot. Place the steamed oysters on a bed of rock salt.
PLATING Flash each oyster with 1 teaspoon of oil. Serve as soon as possible.