Name: On Soups and Broths
Ingredients: 1 pound beef, properly prepared and washed; 4 cups cold water; 2 young carrots; 1 onion, with 2 cloves stuck in it; 1 parsnip; 1 stalk celery; 1 bunch thyme; 1 bunch parsley; ¼ teaspoon coarse sea salt

Why it works: Thyme and parsley match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 9,057 recipes. Both carry cuminaldehyde, which smells Spicy, cumin. The science ↓

On Soups and Broths

Ingredients

Directions

Combine the beef and cold water in a pot.
Bring to a simmer and cook for 5.5 to 6 hours.
Once the liquid has reduced, add the carrots, onion, parsnip, celery, thyme, parsley, and salt.
Continue to simmer until the vegetables are tender.

Recipe from a historical cookbook (Internet Archive).

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.

Thyme + parsleytop 1% of all pairs

Smell alikestrong

Cooked together9,057 recipes

Shared aroma: cuminaldehyde (Spicy, cumin).
Carrot + parsniptop 1% of all pairs

Smell alikestrong

Cooked together1,097 recipes

Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
Carrot + parsleytop 1% of all pairs

Smell alikestrong

Cooked together8,053 recipes

Shared aroma: 2,4-decadienal (seaweed).
Carrot + celerytop 1% of all pairs

Smell alikestrong

Cooked together10,173 recipes

Shared aroma: myristicin (spice, warm).
Parsnip + thymetop 1% of all pairs

Smell alikestrong

Cooked together270 recipes

Shared aroma: beta-phellandrene (minty, terpene).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Beef: Releases gelatin and savory flavor into the water during long, slow simmering.
Carrots: Add sweetness and body to the broth as they soften.
Onion: Adds savory depth and aroma to the broth.
Parsnip: Contributes sweetness and a mellow, earthy flavor.
Celery: Adds aromatic, savory background flavor to the broth.

The step that matters

Simmer gently rather than boil. Vigorous boiling makes the broth cloudy and can emulsify fat into it. A slow simmer keeps the liquid clear while collagen from the beef slowly converts to gelatin.

Swap the onion

How well each one fits the dish's main ingredients (beef, carrot, clove, parsnip, celery, thyme, parsley):

Turnipfits better
Leekfits better
Shallotfits better
Onionthe original

Fit is the average pairing score against beef, carrot, clove, parsnip, celery, thyme, parsley. 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 beef broth recipes

Clear 36 Soup 8 Peptonized 4 with Forcemeat Balls 3 with Rice 3 Carrots in 3 See all 501 →

Roast Beef211 recipes

Beef Loaf175 recipes

Carrot Soup134 recipes

Cream of Celery Soup113 recipes

Like knowing why a recipe works?

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.

On Soups and Broths