Tom Yum Prawn Soup with Lemongrass and Galangal

Vibrant and Bold Tom Yum Prawn Soup

Too many versions of this soup end up tasting like hot, flavored water. Or worse, the lime juice boils, turning the broth bitter and masking the fragrance of the galangal. It is a frustrating gap between what you smell at a street stall and what happens in a home pot.

This method fixes that by separating the infusion from the seasoning. We pull the woody, citrusy notes out of the aromatics first, then add the prawns and mushrooms for a quick poach.

By treating the lime juice and coconut milk as finishing touches, you get a vibrant result. It is an authentic Tom Yum Soup recipe that balances heat, salt, and sour without the bitterness. You can easily make this an easy Tom Yum Soup recipe for a busy Tuesday or a slow Sunday.

It is essentially simmered prawns in flavorful Tom Yum soup that hits every taste bud.

Why the Flavors Pop

Layered Infusion: Simmering the lemongrass and galangal before adding the seafood extracts the oils without overcooking the prawns.

Off-Heat Acid: Stirring in lime juice after the heat is off keeps the citric acid fresh. This prevents the "boiled" taste that makes some soups taste flat.

Prawn Timing: Poaching the prawns for only a few minutes ensures they stay snappy.

Recipe Specs

This dish is light but punchy. Since we use a small amount of coconut milk, it feels rich without being heavy.

Chef: If you can find king prawns with the heads still on, roast the heads in a pan first and use that oil for the broth. It adds a deep, savory crust flavor that is pure street-style gold.

Ingredient Deep Dive

Not every ingredient in this soup is meant to be eaten. The lemongrass and galangal are there for the aroma, not for chewing.

The Fresh List

• 4 cups chicken broth
• 2 stalks lemongrass, bruised and cut into 2 inch pieces Why this? Provides the essential citrus backbone
• 1 tbsp galangal, thinly sliced
• 6 kaffir lime leaves, torn
• 5 Thai bird's eye chilies, smashed
• 1 lb king prawns, peeled and deveined
• 2 cups oyster mushrooms, halved
• 1 small shallot, thinly sliced
• 1 tbsp Thai chili paste Why this? Adds body and a red hue
• 2 tbsp fish sauce
• 3 tbsp fresh lime juice
• 1 tsp palm sugar
• 2 tbsp coconut milk Why this? Softens the heat slightly
• 1/4 cup fresh cilantro

Equipment Needed

The gear list is minimal. Your main requirement is a large pot with a lid. I prefer stainless steel so I can easily see the prawns changing color.

Step-by-step Instructions

Infusing the Aromatic Base

Bring 4 cups of chicken broth to a gentle boil in a large pot. Add the bruised lemongrass, sliced galangal, torn kaffir lime leaves, and smashed chilies.

Simmer on low for 5 minutes until the broth smells woody and fragrant. Note: Avoid a rolling boil so you don't lose the delicate citrus oils.

Building the Flavor Foundation

Mix in 1 tbsp Thai chili paste and the sliced shallots. Simmer for another 2 minutes until the shallots soften and the broth turns a vibrant orange. This develops the rich depth essential for homemade Tom Yum Prawn Soup.

Poaching the Prawns and Mushrooms

Gently slide the king prawns and halved oyster mushrooms into the simmering liquid. Cook for 2-3 minutes until the prawns turn opaque and pink. Ensure they reach 145°F (63°C) internally.

Balancing the Final Taste

Take the pot off the heat. Stir in 2 tbsp fish sauce and 1 tsp palm sugar.

Add 3 tbsp fresh lime juice and 2 tbsp coconut milk. The coconut milk provides a luscious finish.

Ladle into bowls and garnish with 1/4 cup fresh cilantro.

Pro Tips and Pitfalls

Texture is the main concern here. If the prawns feel rubbery, they've spent too much time in the heat. Balance is the next priority: if it's overly tart, add a pinch of sugar, and if it's too salty, a bit more broth will help.

Preventing Rubbery Prawns

Prawns cook rapidly. They should have a gentle curve; if they coil tightly, they are overcooked. Always add them last.

Fixing a Bitter Broth

If the lime juice was boiled, the broth may taste sharp. Use a tiny bit more palm sugar to mellow the flavor.

Handling Low Heat

If the heat isn't coming through, crush a few more bird's eye chilies and stir them in at the end.

Presentation Tips

Serve this in deep bowls. I like to keep the lemongrass stalks in the bowl for the look, but warn guests not to eat them. A few extra sprigs of cilantro on top make it look vibrant and street-ready.

Keeping It Fresh

Place any remaining portions in an airtight container and keep them refrigerated for up to 3 days.

When reheating, warm the soup slowly in a pan over medium-low heat until it reaches 165°F (74°C) inside. Avoid bringing the liquid to a hard boil, or the prawns will become tough and lose their snap.

When reheating cooked leftovers, check with a food thermometer that the centre reaches 165°F (74°C); the appliance temperature and time alone do not confirm this.

It is best not to freeze this soup. The prawns develop a mealy texture, and the lime juice loses its bright, fresh punch.

Easy Swaps and Add-Ins

This base is highly adaptable. To create a Tom Yum Goong Soup with more kick, simply add extra chili paste.

Different Proteins

Create a seafood medley by replacing some prawns with scallops or squid rings. Keep in mind that scallops cook faster than prawns, so add them during the final 90 seconds.

Plant-Based Twist

For a vegan alternative, use tofu cubes instead of prawns and swap the fish sauce for a pinch of salt and some soy sauce. Use vegetable broth instead of chicken broth to keep the dish fully vegan.

Creamy Bangkok Style

For a richer, more indulgent Tom Yum Goong Soup, increase the coconut milk to 1/2 cup. This creates a creamier broth with a softer flavor profile.

High in Sodium