Name: A Simple Soup
Ingredients: 1 cup dried beans or split peas; 2 quarts water; 1 pint milk; 1 tablespoon butter; pepper to taste; coarse sea salt to taste; squares of nicely browned toast

Why it works: Milk and butter match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 81,222 recipes mention both. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

The recipe

Ingredients

Contains: milk (auto-detected from the ingredients and method; we can miss things, so check labels)

Directions

Soak

Soak the beans or split peas overnight.

Cook and sieve

In the morning, boil the soaked beans or peas in 2 quarts of water.
When half cooked, pour off the water and add fresh water.
Cook slowly, adding water as needed to maintain the liquid level.
Simmer until the beans or peas are tender enough to pass through a sieve.

Finish and serve

Add 1 pint of milk and 1 tablespoon of butter, then return to the heat.
Bring to a boil, season with pepper and coarse sea salt, and serve over browned toast.

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 aroma chemistry they share, and how many recipes mention both.

Milk + buttertop 3% of all pairs

Aroma overlapstrong

Mentioned together81,222 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Beans + peppertop 7% of all pairs

Aroma overlapstrong

Mentioned together4,733 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Beans + milktop 10% of all pairs

Aroma overlapstrong

Mentioned together1,263 recipes

Shared aroma: 2,3,5-trimethylpyrazine (cocoa, roasted).
Beans + buttertop 10% of all pairs

Aroma overlapstrong

Mentioned together2,792 recipes

Shared aroma: 2,3-pentanedione (butter, sweet).
Butter + peppertop 11% of all pairs

Aroma overlapstrong

Mentioned together85,512 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

Dried beans or split peas: Break down during long simmering to thicken the soup and give it body.
Milk: Adds richness and a smoother, creamier texture to the soup.
Butter: Adds fat for richness and a silkier mouthfeel.

The step that matters

Simmer until tender enough to pass through a sieve. Legumes need enough time and gentle heat to soften fully; undercooked peas stay grainy and will not purée smoothly. Keeping the liquid topped up prevents scorching and concentration of the soup.

Flavor stand-ins for the beans

How well each one fits the dish's main ingredients (milk, butter, pepper):

Cocoabetter flavor fit
Lima beansbetter flavor fit
Peasabout as good a flavor fit
Beansthe original

Fit is the average pairing score against milk, butter, pepper. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).

“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.