Marinate pork ribs with salt, white pepper, Shaoxing wine, egg, and cornstarch for 15 minutes.
Heat oil for deep frying in a wok to 170°C (340°F). Fry the pork ribs in batches until golden brown and cooked through, about 5-7 minutes per batch. Remove and drain excess oil.
In a clean wok, heat oil. Sauté minced garlic and ginger until fragrant.
Add cubed pineapple, green bell pepper, red bell pepper, and onion. Stir-fry for 2-3 minutes until slightly tender-crisp.
Pour in the mixed sauce ingredients (ketchup, white vinegar, sugar, soy sauce, water). Bring to a simmer.
Stir in the cornstarch slurry to thicken the sauce until it coats the back of a spoon.
Add the fried pork ribs back into the wok. Toss everything to coat evenly with the sauce. Serve immediately.
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