Vietnamese Crab and Tomato Rice Noodle Soup

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A beloved Northern and Central Vietnamese comfort bowl, this tangy tomato-crab soup features delicate crab-and-egg patties simmered in a bright, savory broth and ladled over rice vermicelli. It's served with a platter of fresh herbs and bean sprouts so every spoonful is crunchy, herbaceous, and deeply satisfying.

Nutrition Facts

Per serving (estimated)

• 540 kcalCalories
• 14 gFat
• 3 gSaturated Fat
• 78 gCarbs
• 5 gFiber
• 9 gSugar
• 26 gProtein
• 980 mgSodium
• 720 mgPotassium
• 160 mgCalcium
• 4.5 mgIron
• 28 mgVitamin C
• 120 mcgVitamin A

Ingredients

For the crab patties and broth base

• 400 g fresh lump crabmeat (or 250 g canned crab, well-drained)
• 2 large eggs, lightly beaten
• 2 tablespoons cornstarch
• 2 tablespoons finely chopped yellow onion
• 2 teaspoons ground annatto seeds (or 1 tsp paprika)
• 1 tablespoon Vietnamese shrimp paste (mam tom)
• 1.5 L water or pork-bone broth
• 500 g ripe Roma tomatoes, cored and roughly chopped
• 2 cloves garlic, smashed
• 1 tablespoon sugar
• 1 tablespoon fish sauce, plus more to taste

For the noodles and to finish

• 400 g dried rice vermicelli (bun)
• 200 g fried tofu puffs, halved
• 3 scallions, thinly sliced
• 1 teaspoon freshly ground black pepper
• 1/2 teaspoon fine sea salt

For serving

• 200 g fresh bean sprouts, rinsed
• 1 cup Thai basil leaves
• 1 cup perilla or mint leaves
• 1/2 cup cilantro, roughly chopped
• 2 limes, cut into wedges
• 2 fresh Thai chilies, thinly sliced

Directions

1. Make the crab mixture: In a bowl, gently combine the crabmeat, eggs, cornstarch, chopped onion, and 1 teaspoon of the annatto powder. Using wet hands, form 12-14 small patties (about 3 cm wide) and set them on a plate; do not overmix or press hard.
2. Prepare the broth: Bring the water or pork broth to a gentle boil in a large pot. Add the shrimp paste, stirring to dissolve, then add the chopped tomatoes and garlic. Simmer for 12-15 minutes, mashing the tomatoes against the side of the pot until the broth turns a rich orange-red and the tomatoes break down.
3. Season the broth with sugar, fish sauce, salt, and the remaining annatto powder. Taste and adjust — the broth should be tangy, savory, and lightly sweet.
4. Cook the noodles: While the broth simmers, cook the rice vermicelli in a separate pot of boiling water for 3-4 minutes until just tender. Drain, rinse under cold water, and divide among four large serving bowls.
5. Gently slide the crab patties into the simmering broth and poach for 4-5 minutes, turning once, until set and opaque. Add the tofu puffs and scallions and warm through for 1 minute.
6. Ladle the hot broth, tomatoes, crab patties, and tofu over the noodles. Finish each bowl with black pepper and a squeeze of lime. Serve immediately with the bean sprouts, herbs, chilies, and extra lime wedges on the side so diners can customize their bowls.

Cook’s Notes

• Use fresh lump crabmeat for the sweetest flavor and best texture; canned works well but squeeze out excess liquid first so the patties hold together.
• Annatto seeds give the soup its iconic orange-red color — toast 1 tablespoon in dry oil, strain, and use the infused oil if you can't find ground annatto.
• Shrimp paste (mam tom) is pungent; start with 1 tablespoon and add more only if you want a bolder funk. A small dab goes a very long way.
• For a richer broth, simmer 500 g pork neck bones in 2 L water for 1 hour first, then strain and proceed with the recipe.
• Do not overcrowd the bowls with herbs — serve them on a separate plate so leaves stay crisp and don't wilt from the hot broth.

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