Soak fish maw in water until softened. Drain and squeeze out excess water, then cut into small strips.
In a pot, bring water to a boil. Add ginger, green onions, Shaoxing wine, and fish maw. Blanch for 5 minutes, then drain and rinse.
Prepare cornstarch slurry by mixing cornstarch with water in a small bowl.
In a large pot, bring chicken broth to a boil.
Add fish maw and crab meat to the boiling broth. Cook for 5 minutes.
Slowly stir in cornstarch slurry into the soup while stirring continuously until the soup thickens to your desired consistency.
Whisk egg whites lightly. Slowly drizzle the whisked egg whites into the simmering soup in a thin stream, stirring gently to create "egg flowers".
Season the soup with salt and white pepper. Stir in sesame oil.
Ladle the hot soup into serving bowls. Garnish with chopped coriander and serve with red vinegar on the side.
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