Green onions (optional) Whole shrimp (optional) Combine eggs and water, beating with a wire whisk; set mixture aside. Heat an 20 cm omelet pan or nonstick skillet over medium heat until hot enough to sizzle a drop of water. Add butter, and rotate pan to coat bottom. Pour egg mixture into pan. As mixture starts to cook, gently lift edges of omelet with a spatula, and tilt pan so that uncooked portion flows underneath. Sprinkle half of omelet with shrimp and next 3 ingredients, and fold in half. Transfer omelet to a serving plate. Garnish with whole shrimp and green onions, if desired. Serve immediately.