Sweet and Sour Pork, or Gu Lu Rou, has a history dating back to the Qing Dynasty. Its name “Gu Lu” is said to represent the sound of swallowing (gulping) because the dish is so appetizing. Unlike Westernized versions that use food coloring and excessive sugar, authentic Cantonese chefs use a natural base of rice vinegar and fruit-infused sauces. The goal is to create a “glass skin” on the pork—a crust so crispy that it makes a distinct sound when bitten, even after being coated in liquid.
Ingredients
The Protein:
- Pork: 500g pork collar or neck (梅花肉). This cut has the perfect marble of fat to keep the meat juicy during double-frying.
- Marinade: 1/2 tsp salt, 1 tsp light soy sauce, 1 tsp Shaoxing wine, 1/2 an egg (beaten), and a pinch of white pepper.
The Coating (The “Glass” Crust):
- Starch: 150g high-quality Sweet Potato Starch (coarse) or Cornstarch.
- Oil: At least 1 liter for deep-frying.
The Sauce (The Balance):
- Acidity: 3 tbsp white rice vinegar + 1 tbsp Hawthorn candy/sauce (or plum sauce).
- Sweetness: 3 tbsp sugar.
- Body: 2 tbsp Tomato ketchup, 1 tsp Worcestershire sauce.
- Slurry: 1 tsp cornstarch mixed with 1 tbsp water.
The Aromatics & Texture:
- Vegetables: 1/2 green bell pepper, 1/2 red bell pepper, 1/2 white onion, and 100g fresh pineapple chunks.
- Aromatics: 2 cloves of garlic (minced).
Detailed Instructions
Step 1: Marinating the Pork
Cut the pork into 2.5cm (1-inch) cubes. Mix with the marinade ingredients and let sit for at least 30 minutes. The egg helps the starch adhere, while the Shaoxing wine removes any “porky” odor.
Step 2: The Double-Dredge
Dredge each piece of pork thoroughly in the starch. Press the meat firmly so the starch sticks.
The Secret: Let the coated pork sit on a tray for 5 minutes before frying. This allows the moisture of the meat to “grab” the starch, preventing the coating from falling off in the oil.
Step 3: The First Fry (Cooking the Meat)
Heat oil to 160°C (320°F). Fry the pork in batches for about 3-4 minutes until pale golden. Remove and let rest on a wire rack. This initial fry cooks the meat through while setting the starch layer.
Step 4: The Second Fry (The “Glass” Texture)
Increase the oil temperature to 190°C (375°F). Flash-fry the pork for only 45–60 seconds. This is the most important step. The high heat forces out any trapped oil and moisture, creating a hard, airy, and incredibly crispy shell. Remove and set aside.
Step 5: Stir-Frying the Aromatics
In a clean wok, add 1 tbsp of oil. Sauté the onions and peppers over high heat until they are “charred” but still crunchy. Add the garlic and pineapple. Remove the vegetables and set aside to keep them fresh.
Step 6: Thickening the Sauce
Wipe the wok. Pour in all the sauce ingredients. Bring to a boil. Once the sugar has dissolved and the sauce is bubbling, slowly pour in the starch slurry while stirring. The sauce should become thick enough to coat a spoon—it should look like translucent red liquid silk.
Step 7: The Final Toss
Turn the heat to the maximum. Quickly return the fried pork and the vegetables to the wok. Toss rapidly for no more than 10–15 seconds. Every piece of pork should be glazed, but not soggy. Plate immediately.
Serving Suggestions
Serve with a bowl of steaming jasmine rice. The heat of the rice complements the sweet-and-sour tang of the pork perfectly.
Chef’s Tip
The “Ping” Test: If you have achieved the perfect crust, the pork pieces should make a “clinking” sound against the plate. To keep the dish authentic, use fresh pineapple. The natural bromelain enzymes in fresh pineapple cut through the fattiness of the pork much better than canned pineapple ever could.