Bring the broth or stock to a boil in a saucepan over medium heat. Stir in the creamed corn and bring back to a boil (about 3 minutes).
Stir in the salt, sugar, white pepper, rice wine or sherry, and cooked crabmeat. Cook for about 2 minutes to bring back to a boil again.
Give the cornstarch and water mixture a quick re-stir, and then pour into the boiling soup, stirring to thicken. When the soup has thickened, remove the saucepan from the heat.
Pour the egg whites into the soup in a steady stream, and quickly stir in a clockwise direction until they form thin shreds.
Add the sesame oil and the green onions for garnish if using.