Wash prawns and pat dry thoroughly with paper towels. Ensure they are very dry to prevent splashing when stir-frying.
In a small bowl, combine light soy sauce, dark soy sauce, sugar, white pepper, and Shaoxing wine. Set aside.
Heat cooking oil in a wok over high heat until smoking. Add prawns and stir-fry quickly for 1-2 minutes until they turn orange and almost cooked through. Remove prawns from wok and set aside.
Add a little more oil to the wok if needed. Add ginger slices and minced garlic, stir-fry until fragrant.
Pour in the prepared sauce mixture. Bring to a simmer, stirring constantly.
Return the prawns to the wok. Add evaporated milk and scallion lengths. Toss quickly to coat the prawns evenly with the sauce.
Cook for another 1 minute until the sauce slightly thickens and coats the prawns beautifully. Serve immediately.
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