In a mixing bowl, add the eggs and water and mix well.
Add the shrimp if using, the carrot, and mushrooms and mix those in. Pour the mixture into two small heatproof dishes.
Place the dishes in a steamer (your preferred preference for steaming) and bring up the heat to high. When the water is boiling, steam covered for 7-8 minutes or until the egg is set. Remove the cover and steam for an additional 1-2 minutes.
Carefully remove the dishes, add a dash or two of sesame oil to each dish and sprinkle with the sliced spring onion.
Serve and enjoy. This can be a nice breakfast, a light lunch, or a light dinner with rice on the side.