Banh Da Cua – Hai Phong’s Crab Noodle Soup with Red Rice Noodles

I – Kelly Thuy – arrived in Hai Phong on a cold winter morning. The first thing I did was not go to the waterfront but find a bowl of banh da cua. What struck me first was the colour: the red-brown noodles against the orange-gold broth from the crab roe and tomatoes, the green of morning glory, the dark betel-leaf rolls alongside. One spoonful of broth: the tamarind sourness, the sweet depth of freshwater crab, the shrimp paste umami – all at once. I understood immediately why people who grew up in Hai Phong say that no matter where they go in Vietnam, nothing satisfies the same way.

— Kelly Thuy

What Is Banh Da Cua?

Banh da cua is the staple in the cuisine of Hai Phong, a province in the Red River Delta area of Northern Vietnam. The essential ingredients in this dish include crab, pork wrapped in betel leaves (chả lá lốt), fish cakes, fresh vegetables, and, most importantly, banh da noodles. What makes it different from every other Vietnamese crab noodle dish is a combination of two elements that cannot be substituted: the wide reddish-brown banh da noodles, and a broth with a tamarind sourness rather than the fermented rice sourness used in bun rieu.

Origins

Banh da cua is a famous traditional dish in Hai Phong local cuisine, originating from Cau Dat village, Le Chan district. It was born when Northern fishermen struggled with the hardships of life at sea. The origin of Hai Phong banh da cua is believed to have appeared around the 10th century, when the people of Dat Cang used dipped banh da as a convenient dish on long journeys. Over time, that rustic flavour was combined with fragrant and sweet freshwater crab meat, creating a signature dish carrying the strong identity of Hai Phong cuisine.

Hai Phong’s identity as a major international trading port has always influenced its food culture: richer, more complex, with more layered flavours than the quieter inland cuisine of northern Vietnam. The four-dimensional broth of banh da cua – sour (tamarind), salty-umami (shrimp paste), sweet (bone and crab), aromatic-rich (crab roe) – reflects exactly this character.

Red noodle strands are not just a familiar food, but also a symbol of the familiar meals of the local people. The closeness between the dish and the life of Hai Phong people is vividly reflected through folk songs, proverbs, and folk melodies.

The Two Defining Elements

1. Banh da do noodles – The visual and textural signature

Unlike other kinds of rice noodles in Vietnamese cuisine, banh da noodles have a reddish colour that comes from the juice extract of gấc, a unique Vietnamese fruit. Banh da are wide, flat rice noodles that are naturally or traditionally coloured a deep reddish-brown (or sometimes dark grey) due to the use of a special type of rice and sometimes a touch of gấc fruit pigment or molasses during the drying process. These noodles have a chewier, heartier texture than most other Vietnamese rice noodles.

2. The four-dimensional broth

The broth of banh da cua Hai Phong is built from four flavour pillars that work simultaneously, not sequentially:

Full Ingredient List

How to Make It

Step 1 – Simmer pork bone stock

Blanch pork bones in boiling water (discard that water to remove impurities). Cover with fresh cold water, bring to a boil, skim, reduce heat and simmer 45–60 minutes. Strain through a sieve for a clean stock.

Step 2 – Filter field crab broth (the critical technique)

Pound the cleaned field crabs completely or blend. Combine with approximately 1 litre of water, stir well, then strain through a sieve, discarding solids. Pour the filtered liquid into a pot and heat over low heat without stirring. As the temperature slowly rises, the crab protein coagulates and floats to the surface in firm pieces – these are the crab rieu. Skim them off gently with a ladle, keeping pieces intact. The rieu should be firm, not crumbled.

A banh da cua maker on Cau Dat Street explained: the rieu floats well or badly depending on heat. Too high – the rieu shatters and clouds the broth. Too low – it doesn’t form at all. The right heat is somewhere in between that only practised hands know how to hold. That’s not written in any recipe.

— Kelly Thuy, field notes, Hai Phong

Step 3 – Sauté crab roe and tomatoes

In a pan, heat shallot oil, add the crab roe and stir-fry until deep orange and fragrant. Add the quartered tomatoes and cook until softened. Transfer both to the pork bone stock pot.

Step 4 – Complete the broth

Add the filtered crab water to the stock pot (with tomatoes and roe already in). Add shrimp paste and tamarind juice. Bring to a gentle simmer. Taste carefully and adjust: the finished broth should have all four flavour dimensions present simultaneously – sweet (crab + bone), sour (tamarind), salty-umami (shrimp paste), aromatic-rich (crab roe).

Step 5 – Assemble the bowl

Blanch soaked red noodles in boiling water, drain into serving bowls. Arrange crab rieu, cha la lot, fish cake, cooked shrimp and crab roe on top. Ladle hot broth over. Add spring onions, herbs and fresh chilli. Serve with morning glory or fresh greens on the side.

Flavour and Texture Profile

Banh Da Cua vs Other Vietnamese Crab Noodle Dishes

How to Eat It

• Eat hot immediately – the tamarind flavour and noodle texture both deteriorate as the bowl cools
• Do not add fish sauce – the shrimp paste already provides salt and umami; adding fish sauce overloads the balance
• Morning glory raw or quickly blanched – Hai Phong style eats it crunchy, not fully cooked
• A dash of rice vinegar (not lime) for extra sourness – many Hai Phong stalls keep rice vinegar on the table, not lime
• Chilli fresh or as paste – traditional banh da cua is not heavily spiced; chilli is optional

Where to Eat It

In Hai Phong

• Cau Dat Street, Le Chan district – the neighbourhood most associated with the origin of the dish; multiple traditional stalls operating for decades, most busy from 6am until sold out by early afternoon.
• Tran Phu Street – central Hai Phong’s best-known thoroughfare for banh da cua, with established stalls that locals direct visitors toward. On cold winter nights, after attending language classes, walking along Tran Phu Street with the chilly northeastern wind – a crab noodle soup stall to warm up. Decades have passed, and that stall is still there.
• Traditional markets – Sat Market, Hang Market and An Dong Market all have morning banh da cua vendors who sell out before afternoon.

Outside Hai Phong

• Hanoi – Luong Dinh Cua, Linh Lang, and Kim Ma streets are famous for banh da eateries with authentic Hai Phong flavours, attracting many customers.
• Ho Chi Minh City – Areas like Bui Vien and Le Van Sy also have banh da cua eateries that bring the full flavour of home, serving customers in the southern city.

Price Reference

Nutritional Value

Estimated based on primary ingredients. No independently verified nutritional analysis of banh da cua Hai Phong has been published.

Frequently Asked Questions

What is banh da cua?

Hai Phong’s signature noodle soup: wide reddish-brown chewy rice noodles in a broth made from freshwater field crab, pork bones, tomatoes, shrimp paste and tamarind. Topped with betel-leaf pork rolls (cha la lot), fish cake, shrimp, crab roe and morning glory. Recognised by TasteAtlas as one of “The World’s Best Soups”.

What are banh da noodles?

Wide (3–5mm), flat rice noodles coloured reddish-brown by a special rice variety and/or gac fruit pigment. Chewier and heartier than pho noodles or thin vermicelli; hold their texture in hot broth without going mushy.

How is it different from bun rieu cua?

Same crab base, four key differences: (1) noodle: red banh da (wide) vs white bun (thin); (2) sourness: tamarind vs fermented rice/vinegar; (3) toppings: betel-leaf pork rolls + fish cakes vs fried tofu + blood jelly; (4) overall flavour: richer, more visually dramatic.

What is cha la lot?

Minced pork wrapped in betel leaf (la lot / Piper lolot) and pan-fried or grilled. The betel leaf contributes a distinctive peppery-herbal aroma that is one of the defining flavour notes of banh da cua. Cannot be substituted.

Can I find it outside Hai Phong?

Yes – there are authentic Hai Phong-style banh da cua restaurants in Hanoi (Luong Dinh Cua, Linh Lang, Kim Ma streets) and Ho Chi Minh City (Bui Vien, Le Van Sy areas). Quality is generally best at stalls with demonstrable Hai Phong provenance and high regular-customer traffic.

Conclusion

Banh da cua is what a port city’s food culture looks like when it is completely confident in itself: richer than its hinterland neighbours, more colourful, with a four-dimensional broth that reflects generations of a people who knew both freshwater crab from the paddies and the bold flavours of a trading crossroads. The reddish-brown noodles, the tamarind-sour broth, the betel-leaf pork rolls – none of these elements exist by accident.

If you are in Hai Phong, go to Cau Dat Street at 7am. Order a bowl with full toppings. Drink the first spoonful of broth before touching the noodles. That is the moment that explains why TasteAtlas put this on a list of the world’s best soups.