Rinse the dried scallops and bring the chicken stock to a boil in a pot. Add the dried scallops and ginger, and simmer for 8 minutes to infuse flavour.
While the broth simmers, gently pat the fresh scallops dry with paper towels. Season with salt and Shaoxing wine.
Strain the broth to remove the dried scallops and ginger. Return the strained broth to the pot and bring to a gentle simmer.
Add the sliced mushrooms to the simmering broth and cook for 3 minutes.
Add the choy sum to the broth and cook for 2 minutes until just tender.
In a small bowl, lightly beat the egg whites. Slowly drizzle the beaten egg whites into the simmering broth while stirring gently to create silky egg ribbons. Cook for 1 minute.
Season the broth with salt and sesame oil to taste. Add the fresh scallops and poach gently for 2-3 minutes until just cooked through (they should remain tender and slightly translucent in the centre).
Carefully divide the choy sum, mushrooms, and scallops among four serving bowls. Ladle the hot broth evenly into each bowl and serve immediately.
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