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
Prepare the stock
Wash and soak the ox-tails.
Pour 1 gallon of cold water over the tails and bring to a boil gradually.
Add 1½ ounces of coarse sea salt and remove the scum as it forms.
Once the scum ceases to rise, add the carrots, onions, savory herbs, celery, turnips, cloves, and peppercorns.
Stew gently for 3 to 3½ hours, depending on the size of the tails.
Finish and serve
Remove the tails, strain the broth, and skim off the fat.
Cut the meat from the tails or serve them in joints, and return to the stock.
When the stock begins to boil, stir in a thickening of arrowroot or rice flour mixed with cayenne and salt to taste.
Serve the soup very hot.
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 + celerytop 1% of all pairsSmell alikestrongCooked together10,173 recipes
Shared aroma: myristicin (spice, warm).
-
Carrot + turniptop 1% of all pairsSmell alikestrongCooked together8,002 recipes
Shared aroma: coumarin (sweet, hay).
-
Celery + turniptop 2% of all pairsSmell alikemoderateCooked together4,418 recipes
Shared aroma: coumarin (sweet, hay).
-
Clove + peppertop 5% of all pairsSmell alikestrongCooked together17,451 recipes
Shared aroma: ethyl octanoate (fruity, wine).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Ox-tails
- Provide meat and gelatin-rich collagen that gives the broth body and savoury depth.
- Onions
- Release sugars and aromatic compounds during slow stewing, sweetening and flavouring the broth.
- Carrots
- Add natural sweetness and body to the stock as they soften over long simmering.
- Arrowroot or rice flour
- Thickens the soup, giving it a smooth, slightly glossy body without clouding it.
The step that matters
Skimming the scum while the stock comes to a boil. Scum is coagulated protein and impurities; removing it early keeps the broth clear and clean-tasting. Skimming fat after straining keeps the soup from tasting greasy.
Swap the onion
How well each one fits the dish's main ingredients (carrot, celery, turnip, clove, arrowroot, pepper):
- Parsnipfits better
- Beetrootfits better
- Leekfits better
- Onionthe original
Fit is the average pairing score against carrot, celery, turnip, clove, arrowroot, pepper. 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.
More ox tail soup recipes
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.
Carrot Soup134 recipes
Cream of Celery Soup113 recipes
Turnip Soup43 recipes
Arrowroot Gruel37 recipes