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Canh Bún (Vietnamese noodle soup with crab and water spinach)

Canh Bún (Vietnamese Crab Noodle Soup with Water Spinach)

Canh Bún is a humble, rustic Vietnamese noodle soup with crab and water spinach. It's beloved throughout Vietnam from the North to the South. Luckily, cooking Canh Bún at home is a breeze.
Prep Time: 1 hour
Cook Time: 1 hour
Course: Family meal, Main Course
Cuisine: Vietnamese
Servings: 4 people
Author: Cielle

Ingredients

Broth

  • 1 pound pork ribs (450g)
  • cup dried shrimps (30g)
  • 1 bulb onion
  • 1 stalk lemongrass (optional)
  • 1 tbsp salt (to your taste)
  • 1 tbsp rock sugar (15g) (granulated sugar is ok)
  • 1 tbsp chicken powder (to your taste)
  • 3 tbsp fish sauce (to your taste)
  • 8.5 cup water (2 litesr)
  • 3 tomatoes (cut into wedges)
  • 1 bulb shallot (thinly sliced)
  • 1 tbsp paprika powder
  • 3 tbsp cooking oil
  • Fried tofu

Crab Paste (Riêu Cua)

  • 1 pound ground pork (450g)
  • cup dried shrimps (30g)
  • 4.4 oz crab meat (125g) (optional)
  • 4 tbsp canned crab paste (Bún Riêu Cua seasoning)
  • 1-3 eggs
  • fish sauce (to your taste)
  • sugar (to your taste)

Other ingredients

  • 1 package Bún Bò Huế Thick Rice Noodles
  • 1 bunch Water Spinach (Ong Choy)
  • Mắm Tôm (fermented shrimp paste)
  • Tamarind sauce (optional)
  • Lime/Lemon (cut into wedges)
  • Green onion
  • Cilantro

Instructions

Prepare the broth:

  • Wash the dried shrimps.
  • Parboil the pork ribs with some salt, then thoroughly wash and rinse them.
  • Put the pork ribs back to the pot along with water, onion, lemongrass, dried shrimps, salt, and rock sugar. Simmer over medium-low heat for one hour, making sure to skim off any scum that rises to the surface.
  • In a pan, heat some cooking oil and 1 tablespoon of paprika powder over medium-low heat for about 3 minutes to infuse the red color from the paprika powder into the oil.
  • Add the sliced shallot and sauté until fragrant, then add 2/3 of the tomato wedges. Stir-fry the tomato with some fish sauce until they are soft and fully cooked.
  • Transfer all the tomatoes to the broth. Don't forget to scrape all the tomato sauce from the pan—it's the golden liquid.
  • Finally, add the fried tofu to the broth.

Prepare the crab paste (riêu cua):

  • Rinse the dried shrimps and soak them in water until they become plump and soft. Drain the shrimps, and add the soaking water to the broth.
  • Blend the shrimps in a food processor until they get a cotton floss-like texture.
  • Mix ground pork, dried shrimp, crab meat, crab paste, and eggs in a bowl. Season the mixture with fish sauce and sugar. To taste, microwave a small portion and adjust seasoning as needed. If not using immediately, refrigerate.
  • With two spoons, scoop the crab paste and gently drop it into the simmering broth over medium-low heat. Riêu cua is ready when it floats to the surface. Add the remaining tomato wedges to the broth.
  • Season the broth with fish sauce and chicken powder. Keep in mind that the broth should have a slightly saltier flavor than desired as it will dilute when served with noodles.

Cook rice noodles:

  • Thicker rice noodles require a longer cooking time than regular ones (at least 30 minutes), so I suggest soaking them for at least 2 hours beforehand.
  • When cooking the rice noodles, ensure you use COLD WATER to prevent them from breaking easily. Remember to taste the noodles every few minutes to check their doneness.
  • After cooking, rinse the noodles thoroughly in cold water several times until the water runs clear. Drain the noodles well before serving.

Blanch water spinach:

  • Cut the water spinach into pieces that are 8 inches (20cm) long.
  • Wash the vegetables in water with couple of soaks and rinses.
  • In a pot, add salt to the water and blanch the water spinach in boiling water for about 1 minute.

Serve:

  • In serving bowls, place the rice noodles, followed by pork ribs, crab paste, tofu, water spinach, and tomato. Pour the broth over the noodles. Garnish with green onions and cilantro.
  • Adjust the flavor with mắm tôm and tamarind sauce (or lime) according to your preference. Enjoy!
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