Marinate chicken strips with Shaoxing wine, light soy sauce, sugar, white pepper, and cornstarch for at least 15 minutes.
In a separate bowl, whisk together cornstarch, all-purpose flour, egg, and water to form a smooth batter. It should be thick enough to coat the chicken.
Heat cooking oil in a wok or deep pot to 170°C (340°F). Dip each marinated chicken strip into the batter, ensuring it's fully coated.
Deep-fry the chicken in batches for 3-4 minutes until golden brown and cooked through. Remove and drain on a wire rack lined with paper towels.
Carefully pour out most of the oil, leaving some. Add minced garlic, chopped red chili (if using), and chopped scallions. Stir-fry for 15 seconds until fragrant.
Add the fried chicken strips back into the wok. Sprinkle with the salt and pepper mix. Toss quickly to combine. Serve immediately.
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