To season the shrimp, in a bowl, combine the shrimp with salt and white pepper and mix well, then add the cornstarch and mix to coat evenly. Add the cooking oil and mix again.
To cook the shrimp, in a wok over medium-high heat, heat 1 tablespoon of the cooking oil, then add the shrimp and stir-fry for about 1 minute until lightly pink. Remove the shrimp.
To cook the pork, in the same wok over high heat, add the remaining 1 tablespoon cooking oil, then add the ground pork and cook for about 2 minutes, breaking it apart as it cooks.
To build the base, add the garlic and ginger and stir-fry briefly until fragrant.
To make the sauce, pour in the chicken stock, then season with salt and white pepper and bring to a boil, skimming off any foam.
To combine, return the shrimp to the wok and let it cook briefly in the sauce.
To thicken, in a small bowl, mix the cornstarch with the water to form a slurry, stir again, then pour into the wok and mix until the sauce thickens.
To finish, slowly drizzle in the beaten egg, wait a few seconds until it sets, then gently stir in one direction to form soft ribbons. Add the scallions and sesame oil, then serve immediately.