Why it works: Onion and rice are a kitchen classic. They rank in the top 9% of all ingredient pairs, and 10,433 recipes mention both. Both carry 2,4-decadienal, which smells seaweed. The science ↓
Mulligatawny Soup
Ingredients
Directions
Prepare
Skin and slice the onions.
Make the soup
Fry the onions in the dripping until browned.
Stir in the curry powder and flour, then add enough stock to form a smooth paste.
Add salt and lemon juice just before serving.
Serve with boiled rice.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
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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Onion + ricetop 9% of all pairsAroma overlapmoderateMentioned together10,433 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Lemon + ricetop 12% of all pairsAroma overlapmoderateMentioned together4,366 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Flour + buttertop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Onion + buttertop 15% of all pairsAroma overlapmoderateMentioned together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Butter + ricetop 16% of all pairsAroma overlapmoderateMentioned together9,645 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Flour and butter share little aroma chemistry, yet 124,287 recipes mention both: they likely work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Onions
- Browning them builds sweetness and a deep base flavour for the soup.
- Flour
- Thickens the curry paste so the stock becomes smooth and body-rich.
- Curry powder
- Provides the spiced aroma that defines the soup's character.
- Dripping
- Fat that carries the frying and helps the onions brown evenly.
- Lemon juice
- Adds acidity that brightens the finished soup's flavour.
The step that matters
Fry the onions in the dripping until browned. Onions that are only softened stay pale and taste flat, while properly browned onions develop deep sweetness through the Maillard reaction and caramelisation. Stopping too early or burning them both change the soup's flavour.
Flavor stand-ins for the lemon
How well each one fits the dish's main ingredients (flour, onion, butter, rice):
- Avocadobetter flavor fit
- Coconutbetter flavor fit
- Raisinbetter flavor fit
- Lemonthe original
Fit is the average pairing score against flour, onion, butter, rice. 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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