Soups & Stews
This authentic Thai lemongrass soup recipe transports you to bustling Bangkok streets with its fragrant, citrusy aroma and complex herb blend. ✨ The secret lies in balancing lemongrass, galangal, and kaffir lime leaves—aromatic staples that create that signature Thai depth while keeping the broth bright and refreshing.
I've perfected this version after years of testing, ensuring every sip delivers the perfect harmony of tangy, spicy, and herbal notes.
The foundation begins with a fragrant broth infused with fresh herbs and spices, simmered just long enough to extract their essence without bitterness. Traditional recipes often use chicken or shrimp, but you can adapt it with tofu for a vegetarian twist.
What sets this apart is the careful layering of flavors—starting with a light broth base, then building complexity with coconut milk, lime juice, and chili for that signature Thai kick.
By the time you're done, you'll have a steaming bowl of soup where each spoonful delivers tender protein, fragrant herbs, and a perfect balance of sweet, sour, and spicy flavors.
The aroma alone will have everyone gathering around your table, while the taste transports you to Thailand without leaving your kitchen. This is the kind of recipe that becomes a family staple.
The beauty of this dish lies in its versatility—serve it as a light lunch, a comforting dinner, or even a healing remedy when you're under the weather.
The instructions walk you through each step, from preparing the aromatic paste to balancing the final flavors. Let's create this authentic Thai classic together.
Ingredients for authentic thai lemongrass soup
These fragrant Thai staples create the soul of this bright, citrusy soup—nothing exotic, just good stuff.
| Ingredient | Amount | Notes |
|---|---|---|
| Chicken Breast 🍗 | 1 ½ lb | Boneless, skinless, cut into bite-sized pieces |
| Fresh Lemongrass 🌿 | ½ cup | Tender stems only, finely chopped |
| Galangal 🥕 | ¼ cup | Fresh root, peeled and sliced thin |
| Kaffir Lime Leaves 🍋 | 4 whole | Torn into strips, not stems |
| Thai Chili Peppers 🌶️ | 2 whole | Adjust for spice preference |
| Shallots 🧅 | ½ cup | Minced finely for depth |
| Garlic Cloves 🧄 | 4 cloves | Peeled and smashed |
| Coconut Milk 🥥 | 1 can (13.5 oz) | Full-fat for creaminess |
| Vegetable Broth 💧 | 4 cups | Homemade or quality store-bought |
| Lime Juice 🍋 | ¼ cup | Freshly squeezed |
| Fish Sauce 🍶 | 1 tbsp | Red Boat preferred |
| Palm Sugar 🍯 | 2 tbsp | Or substitute brown sugar |
| Green Beans 🌱 | 1 cup | Trimmed, cut into 1-inch pieces |
| Salt 🧂 | 1 tsp | Kosher or sea salt |
| Black Pepper 🌶️ | ½ tsp | Freshly ground |
The galangal and kaffir lime leaves are the heart of this soup. Asian markets usually carry fresh galangal—it looks like ginger but has a citrusy, peppery kick. If you can't find it, extra ginger at half the amount works in a pinch, though it won't be identical. Kaffir lime leaves? Trader Joe's sells them frozen, or look for them in the refrigerated section. The lemongrass should be tender, not woody—trim the tough bottoms and use only the pale, inner stems. For the chili peppers, leave the seeds in for heat, or remove them if you prefer a milder soup.
No galangal? Extra ginger plus a pinch of cardamom comes close. Running low on fish sauce? Soy sauce at half the amount works, though it won't be as umami-rich. The palm sugar can be swapped for brown sugar, but it adds a slightly different depth. For the green beans, baby snap peas or snow peas are perfect substitutes if you've got them. The coconut milk should be full-fat—canned is fine, but avoid the carton stuff. And if you're making this vegetarian, swap the chicken for extra-firm tofu pressed and cubed.
This soup tastes even better the next day—honestly, the flavors meld overnight. Keeps for 4-5 days in the fridge, but I usually make it fresh since the herbs lose their punch. For storage, let it cool completely, then transfer to an airtight container. Reheat gently on the stove—no boiling, just warm through. The broth reduces slightly when reheated, so add a splash of water if it gets too thick. Freezes beautifully for 3 months if you portion it into containers.
Why You'll Love This Recipe
- Fewer Ingredients, More Impact: I swear by this recipe because it doesn’t require a grocery haul—just five key players (lemongrass, galangal, lime leaves, chili, and chicken) that work magic together. No confusing spice blends or hard-to-find staples; everything’s either in your fridge or at the Asian market’s fresh section.
- Citrusy Heat That Stays: The galangal and kaffir lime leaves give it that bright, herbal punch, while the Thai chilies add just enough fire to linger on your tongue. It’s the kind of flavor that makes you pause mid-sip—like when you first taste something that actually tastes like Thailand, not just "Thai-ish."
- Weeknight to Dinner Party: Make a double batch on Sunday, and you’ve got lunch, dinner, and a last-minute guest meal covered. The broth keeps well, and the chicken stays tender—perfect for reheating or serving over rice with a squeeze of lime. (Yes, even on a Tuesday night.)
- Budget-Friendly Comfort: Chicken breast is cheap, and these aromatics stretch further than you’d think. I’ve fed four people for under $15 with leftovers that taste better the next day. Plus, the galangal and lime leaves freeze beautifully, so you’re not scrambling to use them up.
Step-by-step instructions for authentic Thai lemongrass soup
Here's how to build this fragrant, aromatic soup with layers of citrus and herbal depth.
🍳 Step 1: Build the Herb-Citrus Base
Heat a large pot over medium heat and add 1 tablespoon vegetable oil. Add the 0.5 cup shallots and cook for 3-4 minutes until softened and translucent. This is your flavor foundation—don't rush it or the shallots will burn.
Add the 0.5 cup fresh lemongrass and 0.25 cup galangal (both finely chopped). Cook for 2 minutes until fragrant—you'll smell that bright, citrusy aroma. Then add the 4 smashed garlic cloves and cook for 30 seconds until golden. This quick cooking preserves their freshness while building flavor.
🔥 Step 2: Add Aromatics and Spice
Tear the 4 kaffir lime leaves into strips and add them to the pot. Stir for 1 minute to release their citrusy aroma. Then add the 2 whole Thai chili peppers (keep them whole for easier removal). Pour in the 4 cups vegetable broth and bring to a gentle boil.
Reduce heat to low and let it simmer for 10 minutes to allow all the flavors to meld. The soup should smell vibrant and complex—like a mix of lemongrass, lime, and a hint of ginger. If it reduces too much, add a splash of water to maintain the proper consistency.
👨🍳 Step 3: Cook the Chicken and Green Beans
Add the 1.5 lb bite-sized chicken breast pieces to the simmering broth. Cook for 8-10 minutes until the chicken is no longer pink in the center. Remove the chicken with a slotted spoon and set aside.
Add the 1 cup green beans to the pot and cook for 3-4 minutes until just tender-crisp. The beans should retain their bright green color and slight bite—overcooking will make them mushy. Remove them with a slotted spoon and set aside with the chicken.
🥘 Step 4: Finish with Coconut Milk and Seasonings
Pour in the 1 can (13.5 oz) coconut milk and stir gently to combine. Add the 2 tbsp palm sugar and 1 tbsp fish sauce, stirring until fully dissolved. Taste and adjust seasoning with the 1 tsp salt and 0.5 tsp black pepper—this balances the sweet, sour, and salty flavors.
Return the chicken and green beans to the pot and simmer together for 2-3 minutes to heat through. Stir in the 0.25 cup lime juice just before serving—this brightens the soup and cuts through the richness of the coconut milk.
🍽️ Step 5: Serve with Fresh Herbs and Chili
Ladle the soup into bowls and garnish with additional kaffir lime leaves (torn) and Thai chili peppers (sliced). Serve immediately with steamed jasmine rice on the side. The soup should be fragrant, with a balance of citrusy lemongrass, creamy coconut, and a touch of spicy heat.
For authenticity, I like to serve it with a side of fresh herbs like cilantro or Thai basil. The contrast of temperatures—hot soup with cool herbs—elevates the experience. Enjoy while it's warm, as the flavors meld beautifully in each bite.
Pro Tips For Making Authentic Thai Lemongrass Soup
- CHAR THE GALANGAL FIRST: I learned this the hard way—tossing raw galangal into the broth means you’ll end up with a bitter, underripe flavor. Lightly char the skin side over a gas flame (or under a broiler for 30 seconds) before slicing—it deepens the citrusy, peppery notes and mellows the harshness. (Yes, even if you’re impatient like me.)
- SIMMER THE LEMONGRASS LOW: Lemongrass bruises easily, and over-boiling turns it mushy. Once you’ve split the stalks and simmered them in the broth, keep the heat at a bare simmer—not a rolling boil—and remove them after 15 minutes. If you let them stew too long, they’ll dissolve into the soup, leaving only a faint ghost of their aroma.
- SKIP THE PRE-CUT CHILI PEPPERS: Store-bought sliced Thai chilies lose their punch and texture fast. Buy whole dried chilies, toast them in a dry pan for 30 seconds until fragrant, then crush them with the side of your knife—just enough to release their oils without turning the soup into a powder. Your future self will thank you.
- USE CHICKEN THIGHS NOT BREAST: Chicken breast stays dry and rubbery in broth, no matter how long you simmer it. Swap to bone-in, skin-on thighs—they render fat for richer broth and stay juicy. If you’re set on breast, slice it thinly against the grain and poach it separately in the finished soup for 8–10 minutes. (I know, I know, but trust the process.)
Health benefits of these flavors
Immune-Boosting Powerhouse
This soup is packed with ingredients that strengthen your immune system. The fresh lemongrass and galangal contain powerful antioxidants like citral and gingerol, which help fight inflammation and support immune function. Garlic adds allicin, a compound known for its antimicrobial properties.
Together, they create a natural defense system that helps keep colds and flu at bay. 💪
Digestive Health Support
The combination of kaffir lime leaves and green beans makes this soup excellent for digestion. Kaffir lime leaves contain limonene, which aids in digestion and reduces bloating, while green beans provide fiber to keep your digestive system running smoothly.
The coconut milk also contains medium-chain triglycerides (MCTs), which are easier to digest and provide quick energy. Honestly, I notice my digestion improves after eating this regularly.
Protein-Rich and Balanced
A serving of this soup provides about 30 grams of protein from the chicken, making it a satisfying and balanced meal. The protein helps with muscle repair and keeps you full longer, preventing those mid-afternoon energy crashes.
The fish sauce adds umami depth while providing essential amino acids, and the palm sugar offers a natural sweetness without the blood sugar spikes of refined sugars. It’s the kind of meal that keeps you energized without weighing you down.
Anti-Inflammatory Benefits
The Thai chili peppers and lemongrass are both natural anti-inflammatory agents. Capsaicin in chili peppers helps reduce pain and inflammation, while lemongrass contains compounds that may help lower inflammation markers in the body.
This makes the soup not just delicious but also a great choice for anyone dealing with joint pain or general inflammation. I love making this when I need a comforting yet healing meal. ✨
Rich in Vitamins and Minerals
This soup is a nutritional powerhouse, loaded with vitamin C from lime juice, vitamin K from green beans, and B vitamins from chicken and fish sauce. The galangal adds manganese, which supports bone health, while the shallots provide quercetin, an antioxidant that helps reduce oxidative stress.
It’s like a one-bowl vitamin supplement—naturally delicious and packed with goodness. 💛
Hydration and Electrolytes
The vegetable broth base ensures you stay hydrated while providing essential electrolytes like potassium and magnesium. These minerals help maintain proper fluid balance in your body, making this soup a great choice for hot days or after a workout.
The lime juice also adds a refreshing acidity that enhances hydration. It’s the perfect balance of nourishment and refreshment in every spoonful.
Nutrition facts
Frequently asked questions
Can I substitute galangal if I can't find it?
Yes! Use extra ginger at half the amount (about 0.125 cup) plus a pinch of cardamom for depth. While not identical, this combo mimics galangal's citrusy, peppery kick. The soup will still taste amazing, just with a slightly different aromatic profile.
How spicy should this soup be?
The recipe uses 2 whole Thai chili peppers for mild heat—remove seeds for even gentler spice. For extra kick, add 1 more chili or ½ tsp chili flakes after tasting. Adjust to your preference, but remember: the lime juice brightens the heat, balancing the flavors beautifully.
Can I make this soup vegetarian?
Swap the chicken for extra-firm tofu (pressed and cubed) or mushrooms for umami. Use ½ cup coconut milk extra to compensate for the lack of protein. The broth's herbal notes shine even brighter without meat, making it a fantastic plant-based option.
Why does my soup taste bitter?
Overcooking the aromatics (especially lemongrass or galangal) causes bitterness. Simmer the broth for only 10 minutes—no longer! If it happens, add a splash of lime juice or coconut milk to balance. Also, ensure your broth isn't reducing too much; add water if needed to maintain consistency.
How do I make this soup extra creamy?
For richer texture, stir in ½ cup more coconut milk at the end or blend ½ cup of the soup briefly for a velvety finish. Avoid heavy cream—it overpowers the delicate Thai flavors. Pro tip: Use full-fat coconut milk for the best creaminess without altering the authentic taste.