Why it works: Lemon grass and fish sauce work together. They rank in the top 4% of all ingredient pairs, and 304 recipes mention both. Both carry phenylacetaldehyde, which smells hawthorne, honey. The science ↓
The recipe
Ingredients
Contains: soy, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Make the soup
Place the water, lemongrass, garlic, fish sauce, rice, galangal, and pepper in a large saucepan and bring to the boil.
Add the chicken, mixing well, and cook for 10 minutes, skimming off any white froth which forms.
Serve
Place the spring onions, basil, lemon juice, chili paste, coriander, and lime leaves in a large serving bowl and mix well.
To serve, pour the soup over the onion mixture in the serving bowl, mix well, and serve immediately.
This recipe comes from the Recipes Wiki on Fandom and is licensed CC BY-SA 4.0. Our formatting and summaries are shared under the same licence.
Steps grouped into stages for easier reading; the method is the source's own.
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much aroma chemistry they share, and how many recipes mention both.
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Lemon grass + fish saucetop 4% of all pairsAroma overlaplowMentioned together304 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Garlic + oniontop 1% of all pairsAroma overlapstrongMentioned together29,030 recipes
Shared aroma: furaneol (caramel, strawberry).
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Basil + lemontop 2% of all pairsAroma overlapstrongMentioned together1,820 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Rice + chickentop 2% of all pairsAroma overlapstrongMentioned together4,569 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Pepper + lemontop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Chicken breasts
- Provides the main protein, cooking through in the broth to become tender and savoury.
- Rice
- Releases starch into the broth, lightly thickening it and giving it body.
- Lemongrass (in the method)
- Adds a bright, citrusy aroma that flavours the broth.
- Galangal
- Contributes a sharp, peppery, aromatic flavour distinct from ginger.
- Fish sauce
- Adds salty, savoury depth to the broth.
- Kaffir lime leaves
- Add a fragrant citrus aroma that infuses the hot soup.
The step that matters
Skimming the froth while the chicken cooks. Foam that forms on simmering broth contains coagulated proteins and impurities. Skimming it keeps the soup clear and prevents a scummy, cloudy texture.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (lemon grass, garlic, fish sauce, rice, pepper, chicken, basil):
- Tomatobetter flavor fit
- Capsicumbetter flavor fit
- Potatobetter flavor fit
- Onionthe original
Fit is the average pairing score against lemon grass, garlic, fish sauce, rice, pepper, chicken, basil. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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