Heat oil over high heat in a skillet with a rounded bottom and sloping
sides. In a mixing bowl, whip egg whites, water, salt, and black pepper
together, using a fork. Pour egg mixture into skillet. Cook over
moderately high heat until the bottom is set. Using a heatproof spatula,
move the cooked mixture to the center and allow the uncooked mixture to
flow into the bottom of the pan. When cooked, the omelet should be barely
brown on the bottom, soft and moist in the center. Spoon the filling down
the center of the omelet (*see note). Using a spatula and starting from the
handle side, fold one third of the omelet over the center. With a heated
serving plate in one hand, grasp the skillet in the other, palm up and tilt
so the omelet rolls over onto the plate.
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