Bun Rieu (Vietnamese Crab Noodle Soup)

Bun Rieu is a traditional Vietnamese crab noodle soup featuring a tomato-based broth enriched with crab paste and delicate egg-crab fritters. The secret lies in building the broth in stages—blooming aromatics, developing tomato fond, then finishing with fermented shrimp paste for unmistakable depth.

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Course: Main Course, Soup

Cuisine: Southeast Asian, Vietnamese

Keyword: bun rieu, crab noodle soup, rice noodle soup, Vietnamese crab soup, Vietnamese soup

Prep Time: 45

Cook Time: 1

Total Time: 1 45

Servings: servings

Calories: 485kcal

Equipment

Large stockpot or Dutch oven (8-quart)

Fine-mesh strainer

Large mixing bowl

Wooden spoon or spatula

Ladle

Medium saucepan for noodles

Ingredients

For the Broth

3 quarts pork or chicken stock homemade preferred
2 lbs ripe tomatoes cored and quartered
3 tablespoons neutral oil such as vegetable or grapeseed
6 cloves garlic minced
2 medium shallots thinly sliced
3 tablespoons tomato paste
2 tablespoons fish sauce plus more to taste
1 tablespoon fermented shrimp paste (mam tom) optional but traditional
1 teaspoon sugar
1/2 teaspoon ground annatto seeds or 1 tablespoon annatto oil

For the Crab-Egg Fritters (Cha Cua)

8 oz crab meat fresh or canned, picked over for shells
4 oz ground pork
3 large eggs beaten
2 tablespoons crab paste (mam cua) or additional crab meat
1 teaspoon fish sauce
1/4 teaspoon white pepper

For Serving

1 lb dried rice vermicelli (bun)
8 oz fried tofu puffs halved
1 block congealed pork blood (tiet) cubed, optional
2 cups bean sprouts
1 bunch fresh Vietnamese herbs perilla, mint, Thai basil
1 cup banana blossom thinly sliced, optional
2 limes cut into wedges
2 Thai chilies sliced
1/4 cup fried shallots for garnish

Instructions

Prepare the Crab-Egg Fritter Mixture

In a large mixing bowl, combine the crab meat, ground pork, beaten eggs, crab paste, fish sauce, and white pepper. Mix gently with a fork until just combined—the mixture should remain loose and slightly chunky. Over-mixing creates dense, rubbery fritters. Set aside at room temperature while you build the broth.

Build the Aromatic Base

Heat the oil in a large stockpot over medium-high heat until shimmering. Add the shallots and cook, stirring frequently, until softened and beginning to caramelize at the edges, about 3-4 minutes. Add the garlic and cook until fragrant, about 30 seconds.
Push the aromatics to one side of the pot. Add the tomato paste to the cleared space and cook, stirring constantly, until it darkens slightly and smells less raw, about 1-2 minutes. This blooming step removes the tinny taste and develops deeper flavor.
Add the quartered tomatoes to the pot. Cook, pressing them gently with your spoon to release their juices, until they begin to break down and the liquid reduces slightly, about 8-10 minutes. The goal is to build fond—caramelized tomato bits on the bottom of the pot.

Simmer the Broth

Pour in the stock, scraping up any browned bits from the bottom of the pot. Stir in the fish sauce, sugar, and annatto (for color). Bring to a boil, then reduce heat to maintain a gentle simmer. Cook uncovered for 25-30 minutes to allow flavors to meld.
If using fermented shrimp paste, dissolve it in 2 tablespoons of warm broth, then stir into the pot. Start with half the amount and taste—the shrimp paste adds crucial umami depth but can overpower if too heavy.

Form and Poach the Fritters

Bring the broth to a gentle simmer (180-190°F). Using a large spoon, scoop portions of the crab-egg mixture and gently lower them into the simmering broth. Do not stir. The fritters will sink initially, then float to the surface as they cook through, about 3-4 minutes.
Once all fritters are floating and set, use a slotted spoon to gently break them into large, rustic pieces—this is traditional and allows the eggy curds to distribute throughout the soup. Add the fried tofu puffs to warm through.

Prepare Noodles and Serve

Cook the rice vermicelli according to package directions. Drain and rinse under cold water to stop cooking and remove excess starch. Divide among serving bowls.
Taste the broth and adjust seasoning with additional fish sauce if needed. Ladle the hot broth over the noodles, ensuring each bowl receives pieces of the crab-egg fritter and tofu. Serve immediately with bean sprouts, fresh herbs, lime wedges, sliced chilies, and fried shallots on the side.

Notes

For the most authentic flavor, seek out fresh crab and Vietnamese crab paste (mam cua) from an Asian grocery. The fermented shrimp paste (mam tom) is traditional but optional—it adds unmistakable depth but has a strong aroma that some find challenging.

The broth can be made up to 2 days ahead and refrigerated. Prepare and poach the fritters just before serving for the best texture.

For a vegetarian version, omit the pork, use vegetable stock, and increase the crab paste or substitute with a vegetarian crab paste. The tomato-based broth still delivers remarkable depth.

Nutrition

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