Bún Cá (Vietnamese Fish Noodle Soup)

Bún cá brings together the clarity of a Vietnamese noodle soup with the gentle sweetness of white fish and ripe tomato. The broth is kept light and aromatic, infused with ginger, garlic, spring onion and fish sauce rather than reduced into richness, so the finished bowl feels savoury, fresh and clean. Rice vermicelli gives it substance without heaviness, while dill, coriander, lime and black pepper sharpen the finish at the table. It is the kind of fish soup that suits everyday cooking: warming enough for dinner, quick enough for a practical meal, and easy to adjust with herbs, citrus and seasoning to taste.
Cuisine style Vietnamese noodle soup
Time commitment Under 1 hour
Cooking style Make-ahead friendly

Why this recipe works

  • Clean, layered broth: Ginger, garlic, spring onion whites and fish sauce build a fragrant base without making the soup heavy.
  • Bright finishing balance: Tomatoes soften into the broth, while lime added at the table sharpens the savoury fish and noodle base.
  • Light but satisfying: Rice vermicelli makes the soup filling, while gently cooked fish and fresh herbs keep the bowl delicate and fresh.

Get the most out of this recipe

Texture tips

  • Keep the fish tender: Maintain a gentle simmer once the fish goes in; a rolling boil can toughen the fillets and break them apart.
  • Remove the fish promptly: Lift the fish out as soon as it turns opaque and flakes easily, then return it to the bowls in large pieces.

Ingredient notes

  • Choose firm white fish: A skinless white fish fillet that holds its shape will give the cleanest texture in the broth.
  • Use fresh herbs: Fresh dill and coriander are important for the final lift; dried herbs will not give the same bright finish.
  • Season fish sauce gradually: Fish sauce varies in intensity, so add it in stages and adjust the broth after the fish has cooked.

Make-ahead tips

  • Store parts separately: Keep the broth, fish and noodles in separate containers where possible so the noodles do not absorb too much liquid.
  • Reheat gently: Bring the broth back to a gentle simmer, warm the fish briefly in the hot broth, then pour it over the noodles.
  • Add herbs just before serving: Dill, coriander and lime are best kept fresh and added at the table or just before eating.

Authenticity notes

  • Vietnamese home-style character: The soup follows a light, clear-broth approach, with herbs, lime and fish sauce used to adjust each bowl at the table.
  • Herb balance can vary: Dill gives the soup a distinctive aromatic note, while extra coriander creates a fresher, more familiar herb profile.

Equipment you'll need

Ingredients

Broth and soup

Noodles and finishing

Instructions
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  1. Slice the ginger and lightly crush the garlic cloves. Cut the tomatoes into wedges. Slice the spring onions, keeping the white and green parts separate, then roughly chop the dill and coriander; cut the limes into wedges.
  2. Put the water, ginger, garlic, the white parts of the spring onions, half the fish sauce, and the salt into a stockpot. Bring to a gentle simmer and cook for 15 minutes so the broth turns fragrant. Keep it at a steady simmer rather than a rolling boil.
  3. Add the tomatoes and simmer for 5 minutes until they just start to soften but still hold their shape. Slide in the fish and simmer gently for 4 to 6 minutes, until the fish is opaque and flakes easily. Lift the fish out to a bowl, then taste the broth and adjust with a little more fish sauce if needed.
  4. While the fish cooks, bring a saucepan of water to the boil and cook the rice vermicelli according to the packet instructions until tender. Drain in a colander and rinse briefly with warm water to stop it sticking. Divide the noodles between bowls.
  5. Flake the fish into large pieces and add it to the bowls. Ladle over the hot broth and tomatoes, then top with the green parts of the spring onions, dill, and coriander. Finish with black pepper and serve with lime wedges for squeezing at the table.

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Recipe notes

Tips

  • Keep the broth at a gentle simmer when cooking the fish so it stays tender and does not break up.
  • If you are serving children, add the fish sauce gradually and keep the lime wedges on the side so everyone can season to taste.

Substitutions

  • Replace Fresh dill with Fresh coriander for a more coriander-forward finish.
  • Replace Lime with Lemon for a similar bright acidity.

Storage

  • Refrigerate up to 2 days
  • Store the broth, fish, and noodles separately if possible. Reheat the broth to a gentle simmer on the hob, warm the fish in the hot broth for 1 to 2 minutes, and pour over the noodles; add the herbs and lime just before serving.

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Recipe overview

  • Servings: 4 bowls
  • Total time: 1h (35min active)
  • Difficulty: Medium
  • Cuisine: Vietnamese
  • Allergens:
    Fish
Kid friendly

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