Vegetarian Khmer Noodle Soup with Rhizome Roots

Overhead view of a bowl of vegetarian Khmer noodle soup with rice vermicelli, mushrooms, tofu, cabbage, cucumber, and mint. — A light, aromatic Cambodian noodle soup made without meat.

5.0 from 2 votes

This vegetarian Khmer noodle soup keeps the aromatic heart of a classic Cambodian broth—lemongrass, galangal, and fingerroot—while leaving out the meat. Mushrooms and tofu build a light, savory base that soaks into rice vermicelli.

It is the kind of bowl that feels gentle and satisfying, especially when you want something warm without anything heavy. The broth simmers with whole aromatics first, then finishes with a pounded spice paste and crumbled tofu. Fresh cabbage, cucumber, and mint add crunch at the end.

What You Need

The soul of this soup comes from three rhizomes: lemongrass, galangal, and fingerroot. Fingerroot is the small, finger-shaped rhizome that gives many Khmer soups their gentle, aromatic depth. If you are new to these ingredients, our guide to core Cambodian ingredients explains how they are used in everyday Khmer cooking.

Button mushrooms and firm tofu replace the meat in this version. Rice vermicelli, shredded cabbage, cucumber, and mint complete the bowl.

Equipment

Soup pot: To simmer the mushrooms, scallions, galangal, and water into a light broth.
Small skillet: To sauté the pounded spice paste and crumbled tofu before adding them to the soup.
Mortar and pestle: To pound the lemongrass, fingerroot, garlic, and chili into a fine paste.
Chef’s knife: To mince the garlic, lemongrass, and fingerroot, and to prepare the vegetables.
Cutting board: To safely chop the scallions, mushrooms, cucumber, and cabbage.
Colander: To drain and rinse the cooked rice vermicelli under cold water.
Measuring cups: To measure the water and shredded cabbage.
Measuring spoons: To measure the minced lemongrass, fingerroot, sugar, and salt.
Wooden spoon: To stir the broth and the tofu mixture as they cook.
Ladle: To serve the hot broth over the noodles and vegetables.

How to Make Vegetarian Khmer Noodle Soup with Rhizome Roots

Step 1: Cook the Rice Vermicelli

Bring 5 cups of water to a boil in a large pot. Add ½ package of rice vermicelli and cook until the noodles are tender. Pour the noodles into a colander, rinse them with cold water, drain well, and set aside.

Step 2: Prepare the Fresh Vegetable Garnish

In a large bowl, mix 2 cups of shredded cabbage, 1 peeled and julienned cucumber, and a handful of chopped mint. Set the bowl aside.

Step 3: Simmer the Aromatic Broth

Put 8 oz of button mushrooms, 4 scallions, 1 finger-sized piece of fresh galangal (or 4 slices of frozen galangal), and 5 cups of water into a large soup pot. Cover the pot with a lid and cook for 20 minutes.

After 20 minutes, remove the mushrooms, scallions, and galangal from the pot. Keep the broth simmering gently on the stove.

Step 4: Pound the Spice Paste

Use a mortar and pestle to pound ½ cup of minced lemongrass, 1 tablespoon of minced fingerroot, 3 cloves of minced garlic, and 2 chili peppers (optional) into a fine paste. Set the paste aside.

Step 5: Sauté the Tofu

Preheat a small skillet over medium heat. When the skillet is hot, add 2 tablespoons of vegetable oil and the pounded spice paste. Stir the paste in the oil, then add 2 pieces of firm tofu that have been mashed or crumbled. Stir well and cook until the tofu is coated and heated through.

Step 6: Combine and Season the Soup

Add the sautéed tofu mixture to the simmering broth. Stir and let the soup come back to a gentle bubble. Season with 1 tablespoon of sugar and 1 tablespoon of salt. Stir well, taste, and adjust if needed. The soup is ready when the broth is hot and the tofu has absorbed the aromatics.

To serve, divide the cooked rice vermicelli among bowls. Ladle the hot broth and tofu over the noodles, then top with the cabbage, cucumber, and mint mixture.

Cooking Tips

Pound the spice paste until it is quite fine. A coarse paste can leave tough bits of lemongrass in the broth.
Keep the broth at a gentle simmer after removing the whole aromatics. A hard boil can make it cloudy.
Taste the broth after adding the sugar and salt. The mushrooms and tofu will have absorbed some seasoning, so adjust gradually.

How to Serve

Serve the soup hot, with the noodles and vegetables in separate bowls so each person can build their own bowl. The contrast of the hot, aromatic broth against the cool, crisp cabbage and cucumber is part of what makes this bowl refreshing.

If you enjoy Cambodian noodle soups, you might also like our Cambodian bean thread noodle soup for another light, comforting option. For a more substantial broth-based noodle dish, try Cambodian Phnom Penh noodle soup.

Frequently Asked Questions

Can I make this soup ahead of time?

You can prepare the broth and the pounded spice paste ahead of time. Cook the noodles and cut the vegetables fresh when you are ready to serve, so the textures stay crisp.

How should I store leftovers?

Store leftover soup in a shallow container in the refrigerator within two hours of cooking. According to the FDA’s food safety guidance, refrigerate leftovers promptly and keep them at 40°F (4°C) or below. For best quality, eat the soup within 3 to 4 days.

Final Thoughts

This vegetarian Khmer noodle soup is a quiet, aromatic bowl rather than a heavy one. The rhizomes do most of the work, and the crisp vegetables keep each spoonful lively. It is a good recipe to try when you want to cook with Cambodian flavors but keep things simple and meat-free. For more noodle ideas, browse our Cambodian noodle recipes.