Marinate pork ribs with salt, white pepper, Shaoxing wine, light soy sauce, and egg yolk for 20 minutes.
Coat the marinated ribs evenly with cornstarch.
Heat cooking oil in a wok to 170°C. Deep-fry the ribs in batches until golden brown and cooked through, about 5-7 minutes per batch. Drain well.
In a separate small bowl, mix ketchup, white vinegar, sugar, light soy sauce, and water to create the sweet and sour sauce.
Pour out most of the oil from the wok, leaving some. Sauté bell peppers, onion, and pineapple until fragrant, about 2 minutes.
Add the prepared sweet and sour sauce to the wok and bring to a simmer.
Add the fried pork ribs to the wok and toss to coat evenly with the sauce. Serve immediately.
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