Bā Sī Hóng Shǔ

拔丝红薯 — the Chinese tableside theatre of spun-sugar sweet potato: chunks of sweet potato deep-fried to a crisp golden shell, then tossed in a dark caramel that solidifies into crackling toffee threads as each piece is lifted from the pan and pulled apart

Origin: Fujian Province and Northern China

From the journey of Sweet Potato.

拔丝 (bā sī, 'pull thread') is a category of Chinese dessert cooking rather than a single dish: the technique of coating a deep-fried item in a hot caramel that, when pulled apart with chopsticks at the table, forms the characteristic fine, glass-like threads that give the category its name and its theatrical appeal. The same technique is applied to apple (bā sī píngguǒ), banana (bā sī xiāng jiāo), and taro (bā sī yùtou), but sweet potato is the form most strongly associated with the cooking of Fujian, Shandong, and the northern Chinese wheat-eating tradition where root vegetables are a staple winter food. The sweet potato arrived in Fujian in 1594 through the merchant Chen Zhenlong's legendary mission to Manila, and the province's subsequent enthusiasm for the plant is reflected in its prominent place in Fujianese and Min-style cooking. Bā sī hóng shǔ was served at banquets as a dessert course that doubles as entertainment: the dish arrives from the kitchen in a covered pan and is served at the table, where the diner dips each caramel-coated piece into cold water (often a bowl placed alongside) before eating, which causes the caramel to snap and set to a glass-like crunch around the exterior of the frying-crisp sweet potato. The dish demands precise caramel work (the sugar must reach exactly the right amber stage before the fried sweet potato is added, or the coating will be too pale and flavourless, or too dark and bitter) and so it represents a point where Chinese dessert cooking requires the same technical attention that French confectionery demands.

Ingredients

Sweet Potato

600 g orange-fleshed sweet potatoes, peeled and cut into 3 cm irregular chunks or wedges
4 tbsp cornflour (cornstarch)
1 litre neutral oil, for deep-frying

Caramel

150 g white caster sugar
3 tbsp water
1 tbsp neutral oil
1 tsp white sesame seeds, toasted

To Serve

1 bowl cold water (for dipping at the table)

Method

Toss the sweet potato chunks in the cornflour until evenly coated; shake off any excess. Heat the oil in a wok or deep saucepan to 175°C. Deep-fry the sweet potato in two batches for 4–5 minutes per batch until golden-brown and cooked through. Remove with a slotted spoon and drain on kitchen paper. Keep warm.
In a clean wok or large frying pan over medium heat, combine the sugar, water, and oil. Cook without stirring until the sugar dissolves, then continue to cook, swirling the pan gently but not stirring, until the caramel reaches a deep amber colour, about 6–8 minutes. Remove from the heat the moment the colour is right.
Immediately add the fried sweet potato to the caramel in the wok. Toss quickly to coat every piece, working fast before the caramel sets. Scatter over the sesame seeds as you toss.
Turn out immediately onto a lightly oiled serving plate. Bring to the table at once alongside a bowl of cold water. Each diner takes a piece with chopsticks, dips it briefly in the cold water, and eats it immediately — the water sets the caramel to a glass-like crunch around the potato, and pulling the piece apart with chopsticks reveals the characteristic fine spun-sugar threads.

Notes

The key technical point is caramel temperature and timing. The sugar should reach approximately 160–165°C (the lower end of the hard crack stage) before the sweet potato is added; at this temperature the caramel is deep amber but not yet bitter, and it sets to a crisp glass rather than a sticky toffee when cooled by the cold water dip. A sugar thermometer is strongly recommended for first attempts. Some Fujianese versions add a small amount of light soy sauce to the caramel at the end for a salty-sweet note; this is optional but highly effective.

The Gastrographer

Name: Bā Sī Hóng Shǔ
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Yield: 4
Cuisine: Fujian Province and Northern China
Ingredients: 600 g orange-fleshed sweet potatoes, peeled and cut into 3 cm irregular chunks or wedges; 4 tbsp cornflour (cornstarch); 1 litre neutral oil, for deep-frying; 150 g white caster sugar; 3 tbsp water; 1 tbsp neutral oil; 1 tsp white sesame seeds, toasted; 1 bowl cold water (for dipping at the table)

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Journey Point Map Key

Ingredient originTrade or transit route

Became a culinary stapleColonial / trade control