What
Tang cu li ji is pork tenderloin cut into strips, marinated, battered, fried crisp and tossed in a sweet-and-sour sauce cooked from sugar, vinegar and ketchup. It differs from Cantonese gu lou rou; the English phrase sweet and sour pork mostly means the Cantonese dish, not this one.1,2,6,7
When
No dated text for this dish was found. The account of a sweet-and-sour item on a Tang banquet menu of 708 is quoted from a 2012 book; it concerns the flavor in general and does not name tang cu li ji, so it is only a side note.2
Where
Its place of origin is unsettled. It is classified as Zhejiang cuisine and is also well known in Shandong, Sichuan and Cantonese cooking. A claim that it comes from Jiangsu lacks a cited source; a Shandong cuisine entry lists sweet-and-sour carp and sweet-and-sour loin shreds but not this dish. Harbin's guo bao rou is a related Northeastern dish developed by chef Zheng Xingwen from Beijing quick-fried pork slices; that account gives no year and does not mention tang cu li ji.1,2,3,4,5
How
One method marinates the strips with white pepper, salt, wine, sugar and ginger, coats them in flour, cornstarch and water batter, fries them at about 160 degrees Celsius and ref fries them at about 200 degrees Celsius for 6 to 10 seconds; the sauce combines ketchup, sugar, vinegar, scallion-ginger water and a starch slurry. Another marinates the strips for 15 minutes in salt and oil, coats them in egg and then cornstarch, and pan-fries them in batches, with a sauce of ketchup, cider vinegar, Shaoxing wine, brown sugar and starch. The methods and ingredients differ; this entry sets no standard.6,7
Why
No source was found that explains why the dish became popular. A legend ties it to Qin Shi Huang's liking for sweet and sour flavors, but this is a retold tale, and no text from the Qin period mentions the dish.5
Impact and influence
No intangible heritage listing, time-honored brand or output figure was found for the dish. The English phrase sweet and sour pork mostly means Cantonese gu lou rou, while tang cu li ji is described as a northern Chinese version.1,2,6,7
The Soldier's Mother and Qin Shi Huang
Legend has it that Qin Shi Huang liked sweet and sour flavors, and a soldier's mother, hoping her son would be promoted, cooked this dish for him. He praised it, and the dish spread.
Told in: A popular tale, told by an English-language travel guide (updated August 13, 2025). No text from the Qin period mentions the dish, so this is only a story that circulates.
Grandma Li
This is a simplified home version, not the traditional restaurant method.
This is my simplified home version of tang cu li ji, fried twice in an ordinary wok. The batter amounts and the double frying follow the recipe author Elaine, while the ratio of ketchup, sugar and vinegar in the sauce is my own choice at home, informed by her recipe and one by Maggie Zhu; the two differ in how they fry and how they make the sauce. The frying times and heat are my own judgment, not copied from either one.
Ingredients
- Pork tenderloin 200 g, cut into strips about 1.5 cm thick
- Salt, for the marinade 1 small pinch
- White pepper 1 small pinch
- Cooking wine 10 ml
- Sugar, for the marinade 5 g
- Ginger 3 slices
- All-purpose flour 50 g
- Cornstarch, for the batter 50 g
- Water, for the batter 100 ml
- Cooking oil, for frying about 400 ml
- Tomato ketchup 30 ml
- Sugar, for the sauce 30 g
- Rice vinegar 30 ml
- Water, for the sauce 30 ml
- Cornstarch, for thickening 5 g, mixed with 15 ml water
- Toasted white sesame seeds 1 teaspoon, optional
Steps
- Cut the tenderloin into strips about 1.5 cm thick, mix in the salt, white pepper, wine, sugar and ginger slices, and marinate for 15 minutes.
- Stir the flour, 50 g of cornstarch and the water into a thick batter and let it rest for 10 minutes. Pick out the ginger slices and mix the strips into the batter.
- Stir the ketchup, sugar, vinegar and water together in a small bowl and keep the starch slurry to one side.
- Heat the oil in the wok, and when a drop of batter bubbles up at once, add the strips one by one in two batches, frying each batch to a pale gold and firm, about 3 minutes, then lift them out. I cut one open to check that the pork is no longer pink inside.
- Reheat the oil, put the strips back for about 30 seconds until deep golden and crisp, and drain them.
- Pour off the oil, leaving about a spoonful in the wok. Add the sauce, cook over medium heat until it bubbles hard, then stir in the starch slurry and cook until thick and glossy.
- Add the strips to the wok, toss quickly, sprinkle with sesame seeds, and serve at once.
Tips
- I serve it as soon as the sauce coats the pork, because the crisp crust softens if it sits; this is my own experience.
- I fry in a fairly deep pot with the oil well below the rim, and keep wet hands and water away from hot oil to avoid spattering.
Allergens: wheat, sesame