Why it works: Carrot and turnip match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 8,002 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Thick Ox-tail Soup
Ingredients
Directions
Prepare the base
Cut the ox-tails into pieces.
Place them in a saucepan with 2 quarts of water.
Simmer until well done.
Mix butter and flour in a bowl.
Fry sliced onions in butter until golden.
Add the fried onions to the butter-flour mixture.
Add the herbs.
Make the soup
Boil everything together for 30 minutes.
Strain the soup through a fine sieve.
Cook carrots separately until tender.
Cook turnips separately until tender.
Add the cooked vegetables to the soup.
Mix well.
If needed, adjust the soup with good stock.
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 their aromas overlap, and how often cooks already put them together.
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Carrot + turniptop 1% of all pairsSmell alikestrongCooked together8,002 recipes
Shared aroma: coumarin (sweet, hay).
-
Onion + turniptop 5% of all pairsSmell alikestrongCooked together7,585 recipes
Shared aroma: coumarin (sweet, hay).
-
Onion + carrottop 6% of all pairsSmell alikemoderateCooked together21,601 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Flour + turniptop 7% of all pairsSmell alikestrongCooked together2,874 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they 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
- Ox-tails
- Release gelatin and meaty flavour into the water as they simmer, giving the soup body.
- Butter
- Carries flavour from the fried onions and, with flour, forms the base that thickens the soup.
- Flour
- Thickens the soup when cooked with butter into a roux.
- Onions
- Browning in butter adds sweetness and savoury depth to the soup.
- Carrots
- Add sweetness and soft texture to the finished soup.
- Turnips
- Add a mild, slightly sharp earthy flavour and soft texture to the finished soup.
The step that matters
Adding the butter-flour mixture to the soup. Flour thickens only when its starch is cooked and dispersed. Stirring the flour mixture into hot liquid gradually and keeping it moving prevents lumps, and the soup must then boil long enough for the starch to thicken fully.
Swap the onion
How well each one fits the dish's main ingredients (butter, flour, carrot, turnip):
- Parsnipfits better
- Leekfits better
- Arrowrootfits better
- Onionthe original
Fit is the average pairing score against butter, flour, carrot, turnip. Candidates are from the same food group and used in at least 100 recipes.
“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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