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3 pounds chicken wings
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4 quarts plus 3 tablespoons water
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One 2-inch piece of ginger, thickly sliced and lightly smashed
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3 scallions, white parts only, lightly smashed
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3 tablespoons Asian fish sauce
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1 pound asparagus, sliced crosswise 1/2 inch thick
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1 pound fresh lump crabmeat
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3 large egg whites, lightly beaten
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1 1/2 tablespoons cornstarch
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Kosher salt and freshly ground pepper
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1/2 cup cilantro leaves
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In a large pot, combine the chicken wings with 4 quarts of the water and the ginger, scallions and 2 tablespoons of the fish sauce. Bring to a boil over high heat and skim. Cover partially and simmer over low heat until the stock has reduced by half, about 3 hours. Skim occasionally during cooking.
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Strain the stock into a large saucepan and discard the solids. Add the asparagus and crabmeat to the stock and bring to a boil over high heat. Cover partially, then simmer over low heat until the asparagus is tender and the flavors come together, about 5 minutes.
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Pour the egg whites into the soup in a slow steady stream and blend a few times so the whites cook into strands. In a small bowl, stir the cornstarch with the remaining 3 tablespoons of water until smooth, then stir into the soup. Simmer until the soup thickens, about 1 minute. Season with the remaining 1 tablespoon of fish sauce and salt and pepper. Ladle the soup into bowls, garnish generously with cilantro and serve hot.
Make Ahead
The soup can be prepared through Step 1 and refrigerated for up to 3 days.