Vietnamese Crab Noodle Soup
This bun rieu recipe simmers pork ribs into a light broth, then colours it with tomato and tamarind and floats crab-and-pork cakes on top, served over rice vermicelli with a mountain of fresh herbs. It is not pho: pho's broth is clear, beefy and spiced with star anise, while bun rieu's is tomato-red, sour and built on crab. It is not bun bo hue either: that soup is lemongrass-hot and beef-based, while bun rieu is gentler, sourer and unmistakably crab. One serving is about 650 g.
Bun rieu is one of Hanoi's great street soups, built around freshwater crab, the ingredient in its name. Paddy-field crabs were pounded and strained for their sweet meat, which was mixed with pork and egg into cakes and floated in a tomato-soured broth over rice vermicelli. The dish is older than the city's famous pho stalls in its crab tradition, and it remains the soup Hanoians reach for when they want something sour, savoury and unmistakably of the river delta.
Pairs well with: Shrimp paste, fresh herbs, bean sprouts and chilli
Provenance
Vietnam
Hanoi Street Soup
East & South Asia
Time Dedication
1h 30m
30m prep • 60m cook
Batch Yield
4 Servings
890 kcal per serving
1 serving ≈ 650 g
Technical Skill
Intermediate
Intermediate (Soup)
Meal Timing & Digestive Fit
Breakfast
Not Advised
Lunch
Prime Metabolic Fit
Dinner
Ideal Hearty Main
Snack & Tea
Inappropriate
Hanoi Street Soup
Photo: Enoki Mushroom, CC BY-SA 4.0, via Wikimedia Commons
The Heritage Formulary
Estimated cost: Low — about $4–5 per serving at home (USD)
A good bun rieu is judged by its broth: tomato-red, sour and savoury, with tender crab cakes floating on top.
Execution Methodology & Culinary Technique
Prep Stage: Broth, Cakes and Herbs
30 Mins • Broth & Prep
Rinse the ribs and put them in a pot with the water and onion. Mix the crab meat, ground pork and beaten egg into a soft paste for the cakes. Cut the tomatoes, cube the tofu, soak the vermicelli, and wash the sprouts and herbs so everything is ready before the broth simmers.
Maestro Tip: Mix the crab cakes gently — overworking them makes them tough instead of tender.
45 Mins Gentle simmer, about 95°C (200°F)
Bring the ribs, water and onion to a boil, skim off the foam, then simmer gently for 45 minutes until the ribs are tender and the broth is clear.
Skim often in the first 10 minutes — a clear broth is the mark of a careful cook.
Done when: The ribs are tender and the broth is clear.
10 Mins Simmering broth, about 95°C (200°F)
Shape the crab-pork mixture into small cakes and drop them into the simmering broth. Cook for 8 minutes until they float and are firm and cooked through.
Wet hands stop the mixture sticking while you shape the cakes.
Done when: The cakes float and feel firm when pressed.
10 Mins Pan at medium heat, about 160°C (320°F); broth simmering
Fry the garlic and tomatoes in the oil for 3 minutes until soft, then add them to the broth with the tofu, tamarind, fish sauce, sugar and salt. Simmer 5 minutes and taste — the broth should be sour, savoury and lightly sweet.
Frying the tomatoes first deepens their colour and flavour.
Done when: The broth is tomato-red and tastes sour, savoury and lightly sweet.
8 Mins Boiling water, 100°C (212°F)
Cook the soaked vermicelli in boiling water for 3–4 minutes until tender, then drain and rinse briefly so the strands do not stick together.
Rinsing stops the noodles clumping in the bowl.
Done when: The noodles are tender and separate.
5 Mins Serve hot, 60°C (140°F) or hotter
Divide the noodles into bowls, ladle over the hot broth with ribs, crab cakes and tofu, and top with bean sprouts and herbs. Serve the shrimp paste and chilli on the side so each person seasons their own bowl.
Assemble at the last minute so the herbs stay fresh and green.
Done when: The bowl is hot, red and fragrant, with fresh green herbs on top.
Finishing Touches & Plating
Bun rieu is at its best eaten at once, hot and sour, with a spoonful of shrimp paste stirred in at the table. This bun rieu recipe gives you the tomato-red, crab-scented broth and tender crab cakes of a Hanoi street stall, with the fresh herbs that make the bowl feel alive.
Nutritional Physiology & Benefits
Energy
890
kcal / serving
Protein
47g
Complete AA
Carbs
80g
Complex
Fats
42g
Healthy
| Energy | 890 kcal |
| Protein | 47 g |
| Carbohydrates | 80 g |
| Fat | 42 g |
| Fibre | 4.5 g |
| Sugar | 10.9 g |
| Sodium | 1190 mg |
| Energy | 137 kcal |
| Protein | 7.2 g |
| Carbohydrates | 12.2 g |
| Fat | 6.5 g |
| Fibre | 0.7 g |
| Sugar | 1.7 g |
| Sodium | 183 mg |
Nutrition values are estimated — calculated from USDA FoodData Central values for the listed ingredients.
Vitamins & minerals: Vitamin C (tomato, herbs), vitamin B12 (crab), iron and zinc (pork, crab), calcium (crab, tofu).
Protein from Crab and Pork
Crab, pork and egg give about 47 g of protein per serving, which makes bun rieu a substantial lunch rather than a light soup.
Crab Brings B12 and Zinc
Crab meat is a good source of vitamin B12 and zinc, nutrients that are easy to miss in a noodle-heavy diet.
A Mountain of Fresh Herbs
The sprouts, perilla and mint add fibre, vitamin C and freshness, and they lighten a rich, savoury bowl.
Food Pairings
To optimize nutrient absorption and elevate the sensory depth, pair with these authentic accompaniments:
Sauces
Shrimp Paste
A little shrimp paste stirred into the broth adds the deep, salty funk that is the signature of bun rieu — without it the bowl is only half itself.
Vegetables
Fresh Herbs and Bean Sprouts
Crisp sprouts and aromatic herbs cool the hot broth and add the fresh, green contrast the dish needs.
Drinks
Iced Tea or Sugarcane Juice
A cold, lightly sweet drink balances the sour, salty broth and cools the palate.
Full Menus
Fried Spring Rolls
A crisp spring roll on the side adds crunch and turns the soup into a fuller lunch.
Complete menu
Serve the soup with fried spring rolls on the side and iced tea to drink, with shrimp paste and fresh herbs at the table.
Digestive Guardrails
To prevent digestive distress, sluggishness, or palate clash, avoid pairing the dish with these elements:
Undercooked Crab Cakes
The crab cakes contain ground pork and egg, so they must be cooked right through; undercooked ground pork is a food-safety risk. Cook until the cakes float and feel firm. This is general guidance, not medical advice.
Too Much Shrimp Paste at Once
Shrimp paste is intensely salty and pungent; stir in a little at a time and taste — a whole spoonful at once can overwhelm the bowl and push sodium very high.
General information only, not medical advice — consult a doctor for personal dietary decisions.
Who Should Eat It
Health Conditions — Adjust or Avoid
If you have a medical condition, consult your doctor before changing your diet.
Storage & Use
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Immunity & Warming
Slow-simmered bone broth with rice noodles, rare beef and fresh herbs.
Vietnam
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Fresh rice paper rolls filled with poached prawns, tender pork, rice vermicelli, lettuce, herbs and carrot, served with a peanut dipping sauce.
Light Digestion
Nothing is fried, so the rolls stay light and fresh — a cool, herb-filled snack for hot days.
Vietnam
1h 45m
Pork belly slowly braised in coconut water and caramel until meltingly tender, with golden eggs that soak up the sweet-savoury sauce — the Vietnamese family dish that tastes better the next day.
Comfort & Sustained Energy
Slow-braised pork belly and eggs in coconut water and caramel.
Vietnam
1h 10m
WARNING: This dish is made from raw duck blood and eating it is NOT recommended. Raw blood can carry Streptococcus suis (which causes meningitis and sepsis — people in Vietnam have died after eating pig-blood tiet canh), avian influenza from duck blood, salmonella and other dangerous germs. Vietnam's Ministry of Health advises against eating tiet canh, and no preparation method — not even blood from a fresh or trusted source — makes raw blood fully safe. This page describes the traditional Hanoi preparation, tiết canh vịt, for cultural knowledge only. One serving is about 241 g: a small bowl of fresh duck blood mixed with fish sauce, poured over finely chopped cooked duck meat and left to set into a soft, trembling jelly, then finished with crushed roasted peanuts, fresh herbs, lime and chili, and served cold.
Cultural Discovery
A traditional northern Vietnamese snack of raw duck blood set into a soft jelly with cooked duck meat, herbs and peanuts — described here for cultural knowledge, with a serious safety warning.
