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Mix together the mushrooms and first seasoning ingredients and stem over medium heat, 20 minutes. Drain and reserve liquid.
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Combine prawns, egg white, pork fat and second seasoning ingredients. Throw lightly against inside of bowl to mix well.
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Dust the underside of mushrooms with cornstarch. Fill each with some prawn mixture and level with back of spoon.
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Place 1-2 coriander leaves on each filled mushroom.
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Steam over high heat, 5 minutes. Dish up.
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Combine stock, salt, sesame oil and reserved mushroom liquid in a pan. Bring to the boil. Thicken with cornstarch-paste and pour over mushrooms. Serve hot.