Why it works: Ketchup and cream work together. They rank in the top 12% of all ingredient pairs, and cooks put them together in 279 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
Ox Tail Soup
Ingredients
Directions
Prepare the tails
Clean and cut the ox tails into pieces.
Simmer and strain
Boil the tails quietly in water for several hours.
Add the crust of bread and salt to the pot.
Once tender, strain the liquid and remove the fat.
Finish and serve
Thicken the soup with a little cream and stir in the ketchup.
Serve the soup with the tails cut into pieces.
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.
-
Ketchup + creamtop 12% of all pairsSmell alikemoderateCooked together279 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Bread + ketchuptop 22% of all pairsSmell alikelowCooked together813 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Bread + creamtop 24% of all pairsSmell alikelowCooked together5,789 recipes
Shared aroma: delta-decalactone (sweet, creamy).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Ox tails
- Collagen slowly breaks down into gelatin during long simmering, giving the soup body and richness.
- Bread crust
- Its starch helps thicken the broth slightly.
- Cream
- Adds richness and a smoother, rounder mouthfeel to the soup.
- Ketchup
- Adds sweetness and acidity that balance the savory broth.
The step that matters
Keep the soup at a gentle simmer. A quiet simmer lets collagen in the tails break down slowly into gelatin, giving body, while a hard boil can cloud the broth and toughen the meat.
“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.
Brown Bread461 recipes
White Bread80 recipes
Bread Omelette60 recipes
Oatmeal Bread51 recipes