Vietnamese National Dishes

Bún riêu cua (Vietnamese Crab and Tomato Noodle Soup)

Bright tomato broth, tender crab curds and fresh herbs

Vietnamese National Dishes
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Vietnamese crab and tomato rice vermicelli soup with a soft crab curd, fried tofu, scallions and herbs
Tomato broth, tender crab curd, rice noodles and fresh Vietnamese herbs.
Yield 4 large bowls
Cook time 55 minutes
Passive time 15 minutes
Total time 105 minutes
Calories About 740 kcal per serving
Ingredients ↓
Overview

Bún riêu cua (Vietnamese Crab and Tomato Noodle Soup)

Bún riêu cua is a Vietnamese rice-vermicelli soup known for its gently tangy tomato broth and soft crab topping. This practical northern-style home version uses pasteurized crab meat and seasoned crab paste in place of fresh field crab, then sets the mixture with egg into tender curds. Fried tofu, herbs and lime make each bowl lively and filling. Recipes vary by household and region, so this is one coherent version rather than a fixed formula.

In the classic broth, freshwater paddy crab is pounded and strained so its flavor can enrich the soup. Home versions vary: some use fresh crab, while others combine seasoned crab paste with crab meat and egg to make soft riêu. Tomatoes bring a sweet-sour note, and tofu and rice vermicelli turn the broth into a full meal. Fermented shrimp paste is a familiar seasoning, though the amount and whether it is cooked into the pot or offered separately can differ.

This recipe uses refrigerated pasteurized crab meat and a small amount of seasoned crab paste, which makes the technique accessible when fresh cua đồng is unavailable. It does not claim that prepared crab tastes exactly like freshly strained field crab. The curds are cooked gently and left undisturbed so they set in broad, tender pieces instead of breaking apart.

Practical

Practical

  • Keys to successChill the crab mixture while you prepare the broth, and lower the heat before adding it. Spoon broad mounds onto a barely simmering surface; do not stir while the egg-containing curds set. Check the centre of a curd with a thermometer and cook it to at least 71°C (160°F). Keep noodles, broth and herbs separate until serving so each bowl stays fresh.
Ingredients

Ingredients

Crab riêu

  • 170 g seasoned crab paste in soybean oil, label-checked
  • 150 g pasteurized lump crab meat, drained and picked over
  • 2 large eggs (about 100 g without shells)
  • 20 g dried shrimp, soaked 15 minutes, drained and finely ground

Broth

  • 1.8 L low-sodium pork stock
  • 500 ml water
  • 700 g ripe tomatoes (about 6 medium), cut into wedges
  • 100 g shallots (about 5 medium), thinly sliced
  • 20 ml neutral oil
  • 15 ml annatto oil
  • 20 g tamarind concentrate
  • 20 ml fish sauce
  • 8 g fermented shrimp paste (mắm tôm)
  • 5 g fine sugar
  • 3 g fine salt, plus more only if needed

To serve

  • 300 g dried rice vermicelli (bún)
  • 250 g firm tofu, patted dry and cut into 2 cm cubes
  • 30 ml neutral oil for shallow-frying the tofu
  • 120 g bean sprouts, washed
  • 100 g banana blossom, very thinly sliced (optional if unavailable)
  • 25 g perilla leaves, washed
  • 25 g mint leaves, washed
  • 20 g Vietnamese balm or rau kinh giới, washed
  • 25 g scallions, thinly sliced
  • 1 lime (about 70 g), cut into wedges
  • 5 g red chilli, thinly sliced (optional)
Method

Method

Method

  1. Soak the dried shrimp in cool water for 15 minutes. Drain and grind finely. Pat the tofu dry and shallow-fry it in 30 ml oil, turning until golden on several sides; drain. Wash and prepare the herbs and vegetables, then keep them chilled.

  2. Gently combine the seasoned crab paste, picked crab meat, eggs and ground shrimp. Keep some crab texture instead of beating the mixture smooth. Cover and refrigerate while you prepare the broth.

  3. Warm 20 ml oil in the soup pot. Add the shallots and cook over medium heat until softened, about 3 minutes. Add about half the tomato wedges and cook until juicy and beginning to collapse, about 5 minutes.

  4. Add the stock, water, tamarind concentrate, fish sauce, fermented shrimp paste, sugar and salt. Bring to a gentle simmer and cook for 10 minutes so the flavors come together. Taste and adjust only if needed; keep the broth gently bubbling.

  5. Lower the heat until the broth barely simmers. Spoon the crab mixture into several broad mounds on the surface. Do not stir. Partially cover and poach for 8–10 minutes, until the curds are set and the centre of the thickest one reaches at least 71°C (160°F). Lift them carefully with a slotted spoon.

  6. Add the remaining tomatoes and fried tofu around the curds. Simmer gently for 5 minutes, until the tomatoes soften but still hold some shape and the tofu is hot. Drizzle the annatto oil over the broth. Cook the vermicelli according to its packet directions, drain well and divide among four warmed bowls.

  7. Ladle broth and tomatoes around the noodles and place one crab curd in each bowl. Serve with tofu, sprouts, banana blossom, perilla, mint, Vietnamese balm, scallions, lime and optional chilli. Keep hot food at or above 60°C if serving is delayed. Refrigerate perishable leftovers within 2 hours at or below 4°C; use within 3 days and reheat once to 74°C (165°F) throughout.

Practical

Practical

Practical tips

Follow the noodle packet: dried vermicelli brands differ in soaking and cooking time. Rinse briefly only if the package recommends it, then drain well. If banana blossom is unavailable, serve extra bean sprouts and herbs; the bowl will still have its fresh, crunchy contrast. Mắm tôm is strong and salty. Measure the amount into the broth and simmer it; add lime at the table for brightness. Keep the washed greens chilled and dry until the bowls are assembled.

Troubleshooting

The crab mixture breaks apart: The broth may be boiling or was stirred too soon. Lower the heat and leave the curds undisturbed until set. The soup tastes too sharp: Add a little hot stock or water, then taste again. Tomato acidity and tamarind strength vary. The broth tastes too salty: Add hot water a little at a time. Seasoned crab paste and fish sauce vary considerably by brand.

Frequently asked questions

Can I use fresh freshwater crab? Yes. Fresh cua đồng is the classic source of the crab flavor, but it needs careful cleaning, pounding and straining. This recipe uses pasteurized crab and seasoned crab paste as a practical home option; the flavor will be different. What is annatto oil? It is neutral oil infused with annatto seeds, used for a warm red-orange color. Use a prepared food-grade annatto oil and follow its label; a small amount of mild paprika oil can add color, though the flavor is not identical. Can I make the soup ahead? You can prepare the broth a day ahead and refrigerate it promptly. Cook the noodles fresh, then reheat the broth until steaming hot and assemble the bowls just before serving. Keep the raw-egg crab mixture refrigerated and cook it fully when you are ready to eat.

Nutrition per serving (estimate)

Nutrition per serving (estimate)

  • Serving sizeOne quarter of recipe, with noodles, broth, crab curds, tofu and accompaniments
  • Calories740 kcal
  • Carbohydrate82 g
  • Protein38 g
  • Fat28 g
  • Fibre7 g
  • Sodium1,750 mg
Allergens and food safety

Allergens and food safety

Contains crab and shrimp (crustacean shellfish), fish sauce, fermented shrimp paste, egg and tofu/soybean oil. Check labels for additional soy, wheat or gluten and cross-contact warnings; choose suitable certified products when needed. Keep seafood refrigerated and separate from ready-to-eat herbs and utensils. Cook the egg-containing crab curds until their centres reach at least 71°C (160°F); use a clean thermometer, since colour alone is not a reliable safety test. Keep the broth hot for serving. Refrigerate perishable leftovers within 2 hours in shallow containers at or below 4°C, use within 3 days and reheat once to at least 74°C (165°F) throughout.

How to serve

How to serve

  • Keep some tomato and crab curd visible on top of each bowl.
  • Offer lime wedges and chilli separately so diners can adjust the tang and heat.
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