Why it works: Turnip and arrowroot share more aroma than cooks usually use. They rank in the top 1% of all ingredient pairs, and cooks put them together in 64 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Ox Tail Soup
Ingredients
Directions
Make the broth
Combine ox tails, onions, carrots, turnip, flour, white pepper, and water in a large pot.
Bring to a boil and cook for 2 hours.
Finish the broth
Remove the tails.
Cut the meat into small pieces.
Return the bones to the pot.
Boil for an additional hour.
Strain the soup.
Thicken and finish
Mix the arrowroot with the meat.
Add the mixture to the soup.
Boil for 15 minutes.
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.
-
Turnip + arrowroottop 1% of all pairsSmell alikestrongCooked together64 recipes
Shared aroma: coumarin (sweet, hay).
-
Carrot + turniptop 1% of all pairsSmell alikestrongCooked together8,002 recipes
Shared aroma: coumarin (sweet, hay).
-
Flour + arrowroottop 2% of all pairsSmell alikestrongCooked together525 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
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).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Ox tails
- Long simmering breaks down their connective tissue, giving the broth body and rich flavor.
- Onions
- Cooking softens them and adds sweetness and savory aroma to the broth.
- Carrots
- They release natural sweetness and color into the broth as they simmer.
- Flour
- Its starch thickens the broth slightly during the long simmer.
- Arrowroot
- Added near the end, this starch thickens the soup to a glossy, smooth consistency.
The step that matters
Adding the arrowroot mixture to the soup. Arrowroot thickens quickly when heated, but prolonged boiling can thin it out again. Keep the final boil short and watch the soup's consistency.
Swap the white pepper
How well each one fits the dish's main ingredients (onion, carrot, turnip, flour, arrowroot):
- Capersfits better
- Turmericfits better
- Parsleyfits better
- White pepperthe original
Fit is the average pairing score against onion, carrot, turnip, flour, arrowroot. 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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