Lemongrass and Lime Broth
A fragrant Thai-inspired vegetable broth infused with lemongrass, lime leaves, and galangal. This aromatic base is perfect for soups, curries, and rice dishes, delivering bright citrus and warm spice notes without any heaviness.
- Prep
- 10 min
- Cook
- 35 min
- Total
- 45 min
- Makes
- About 4 cups (960 ml) broth
Steps
Before you start
- Gather fresh lemongrass, lime leaves, and galangal—frozen work if fresh unavailable
- Have a fine-mesh strainer or cheesecloth ready
- Use filtered or spring water for the cleanest flavor
Char the onion (optional)
- Heat a dry skillet over medium-high heat.
- Place the onion halves cut-side down in the pan and let them char for 2–3 minutes until the cut surface turns golden-brown and caramelized.
- This adds a subtle toasted depth to the broth.
- Transfer to a plate.
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Ready when: Onion cut surface is golden-brown and caramelized
Tip: Charring is optional but worth the 3 minutes—it adds sweetness and color to the finished broth.
Add ingredients to pot
- Pour 5 cups (1200 ml) cold water into a 6-quart pot.
- Add the smashed lemongrass stalks, kaffir lime leaves, galangal slices, and the charred onion halves (or raw onion if skipping the charring step).
- Add the black peppercorns if using.
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Tip: Smash the lemongrass with the spine of your knife to release aromatic oils without breaking the stalks into tiny pieces.
Bring to a boil
- Set the pot over medium-high heat and bring the water to a rolling boil, about 5–7 minutes.
- You'll see steam rising and small bubbles breaking at the surface.
- Once it reaches a boil, reduce the heat to low.
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Ready when: Water reaches a rolling boil with larger, vigorous bubbles
Tip: Don't skip the boil—it helps extract flavors quickly before you lower the heat to a gentle simmer.
Simmer the broth
- Once the heat is lowered to low, maintain a gentle simmer—just a few lazy bubbles breaking the surface every couple of seconds.
- Let the broth simmer undisturbed for 25–30 minutes.
- The longer it simmers, the more intense the lemongrass and galangal flavors become.
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Ready when: Broth is fragrant and pale golden; lemongrass and lime leaves have softened and released their oils
Tip: Avoid a rolling boil—it will cause the broth to become cloudy and may scald the delicate lime leaves.
Taste and season
- Remove the pot from heat and let it cool for 2 minutes.
- Taste a spoonful of broth carefully.
- Add kosher salt gradually, stirring between additions, until the broth tastes clean and bright but not salty—you want the lemongrass and galangal to sing.
- A squeeze of fresh lime juice (about ½ teaspoon) can be added for extra brightness if desired.
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Ready when: Broth tastes balanced, with bright citrus and warm spice notes
Tip: Taste before adding all the salt—the broth will concentrate slightly as it cools, so err on the side of under-seasoning.
Strain the broth
- Set a fine-mesh strainer over a large bowl or measuring cup.
- Pour the broth through the strainer to remove all solids: lemongrass, lime leaves, galangal, and onion.
- Press gently on the solids with a wooden spoon to extract every drop of flavorful liquid, but don't force them through.
- For crystal-clear broth, line the strainer with cheesecloth and strain a second time.
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Ready when: All solids are removed; broth is clear or translucent
Tip: Don't force the solids through the strainer—you'll cloud the broth. Gentle pressure is enough to release extra liquid.
Good to know
Tips
- Smash the lemongrass with the spine of a chef's knife to split and bruise the stalks, releasing aromatic oils. Avoid pulverizing it into tiny pieces, which can make the broth gritty.
- Fresh kaffir lime leaves are worth seeking out in Asian markets or online—their distinctive flavor is irreplaceable. Frozen leaves work perfectly and are easier to find.
- Use this broth as the base for Thai soups, curries, risottos, or grain pilafs. It also freezes beautifully in ice cube trays for quick flavor boosts.
- For a richer broth, add a 2-inch (5 cm) piece of kombu (dried kelp) or 2–3 dried shiitake mushrooms during simmering. Add them with the other ingredients and strain as directed.
Make ahead
Broth can be made up to 3 days ahead. Let it cool to room temperature, then store it covered in the refrigerator. Or freeze for up to 3 months in ice cube trays (each cube is about ¼ cup / 60 ml) for easy portioning.
Storage & reheating
Room temperature: cool to room temperature uncovered, then cover and refrigerate immediately (do not leave out more than 2 hours). Refrigerator: store in an airtight container for up to 3 days. Freezer: freeze in ice cube trays or freezer-safe containers for up to 3 months. Reheat gently in a saucepan over low heat until warmed through, or thaw and use cold.
Substitutions
- fresh or frozen kaffir lime leaves → 2–3 fresh lime leaves can be replaced with the zest of 1 lime added during the last 5 minutes of simmering. Lime zest is more assertive; use less. Fresh leaves are preferred for their subtle, distinct flavor.
- fresh galangal root → If fresh galangal is unavailable, use 1 tablespoon (6 g) dried galangal powder or 1–2 slices of fresh ginger root (though flavor will be different). Ginger is sharper and spicier than galangal; use only half the amount or taste often to avoid overpowering the broth.
- fresh lemongrass stalks → 1 tablespoon (6 g) dried lemongrass or the zest and juice of 2 fresh lemons. Dried lemongrass is concentrated; reduce the amount. Lemon juice adds acidity but lacks the floral note of fresh lemongrass.
- yellow or white onion, unpeeled → 2–3 shallots or 1 leek (white and pale green parts only, cleaned and halved). Shallots and leeks are milder; they add sweetness but won't give the same caramelized depth as onion.
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