Sweet and Sour Pork

Method

1. Prepare the pork. Toss the cubes in beaten egg, then coat in cornstarch, shaking off excess. The coating should be thin and even — not clumpy. Let the coated pork sit for 5 minutes so the cornstarch adheres.

2. Mix the sauce by combining rice vinegar, ketchup, sugar, and soy sauce in a small bowl. Have the cornstarch slurry ready separately. Set both within arm's reach of the stove.

3. First fry at 325°F. Heat 2 inches of oil in a wok. Fry the pork in batches for 3 minutes until cooked through but pale — no significant browning. Remove to a wire rack. This par-cooks the pork and sets the cornstarch coating.

4. Second fry at 375°F. Increase the oil temperature and fry the pork again for 1.5–2 minutes until golden brown and crispy. The higher temperature crisps the exterior rapidly. Remove to the wire rack.

5. Stir-fry the vegetables. Pour off all but 1 tablespoon of oil. Over high heat, stir-fry the peppers and onion for 2 minutes until crisp-tender. Add the pineapple and toss for 30 seconds.

6. Add the sauce and bring to a bubble. Stir in the cornstarch slurry and cook for 30 seconds until the sauce thickens and turns glossy. Add the crispy pork and toss quickly — 10 seconds maximum. The pork should be coated but not sitting in sauce. Serve immediately over steamed rice.

Equipment

• Wok or deep skillet (for frying) Recommended: Joyce Chen 14-Inch Carbon Steel Wok
• Instant-read thermometer (for oil) Recommended: ThermoWorks ThermoPop 2
• Wire rack set over sheet pan Recommended: Checkered Chef Stainless Steel Wire Rack
• Spider strainer or slotted spoon

Chef Notes

• The most important thing: Double-fry the pork. First fry at 325°F to cook through (3 minutes, pale and soft). Second fry at 375°F to crisp (2 minutes, golden and crunchy). This two-stage method creates a shatteringly crispy coating that stays crispy even after being sauced.
• The cornstarch coating, not batter, is what makes this authentic. Toss the pork in egg, then cornstarch — the thin coating fries into a delicate, crispy shell. Thick batter is the Westernized version.
• Mix the sauce before you start cooking. Once the wok is hot, everything moves in 2 minutes. Having the sauce pre-mixed prevents scrambling.
• The ketchup is not inauthentic — it's been used in Chinese sweet and sour sauce since the early 20th century. It provides tomato flavor, sweetness, and the characteristic red color.
• Don't sauce the pork until the moment you serve. The crispy coating absorbs liquid quickly — toss and plate immediately.

Common Substitutions

Ingredient	Substitution	Notes
Pork loin	Chicken breast or firm tofu	Chicken: same technique. Tofu: press dry, coat in cornstarch, fry once at 375°F
Ketchup	2 tbsp tomato paste + 1 tbsp sugar	More concentrated — adjust sweetness
Rice vinegar	Apple cider vinegar	Slightly different acidity — both work
Pineapple	Mango chunks	Different fruit, same sweet-tart contrast
Deep frying	Air fryer at 400°F	Spray with oil. Less crispy but much less oil

What You're Practicing

Sweet and sour pork teaches you the double-fry technique — the same method used for the crispiest French fries, Korean fried chicken, and Japanese karaage. The first fry cooks the interior; the second fry crisps the exterior. The brief rest between fries allows the surface moisture to evaporate, which is what makes the second fry so effective. Visit Techniques for more on frying science.

You're also learning the Chinese approach to sauce balance — sweet (sugar), sour (vinegar), salty (soy), and umami (ketchup) in a single sauce, thickened with a cornstarch slurry for glossy coating power. This same sauce-building technique applies to kung pao, General Tso's, and orange chicken. Explore more at Techniques.