How to Make It
Put the mushrooms into a bowl, cover with cold water, and soak for at least 20 minutes, or until softened. Remove the mushrooms, squeeze dry, and discard the stems. Drain and finely chop.
In a bowl, soak the oysters in cold water for 15 minutes, or until softened and thoroughly cleaned. Finely chop.
Combine the pork, salt, and 2 tablespoons water in a separate bowl and marinate for 10 minutes. Mix in the cornstarch (cornflour).
Heat 2 tablespoons vegetable oil in a wok or large skillet (frying pan) over medium-high heat, add the pork, and stir-fry for 3–5 minutes, or until cooked through. Transfer to a plate.
Heat the remaining 1 tablespoon oil in the wok over medium-high heat, add the ginger and shallots, and stir-fry for 1 minute until fragrant. Stir in the oysters, mushrooms, carrots, sausage, bean paste, oyster sauce, ginger juice, sugar, pork, and water chestnuts. Toss well and mix in the sesame oil.
Transfer the oyster mixture to a platter, garnish with puffed vermicelli, if using, and serve with the lettuce cups.