Name: Vegetable Soup
Ingredients: 2 tomatoes; 2 potatoes; 2 onions; 1 tablespoon rice; 1 quart water; coarse sea salt to taste; dry toast

Why it works: Potato and onion are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Vegetable Soup

Ingredients

Directions

Slice the tomatoes, potatoes, and onions.
Add them to a pot with the rice and water.
Boil for 1 hour.
Season with salt.
Strain the soup and pour it over a piece of dry 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.

Photo for illustrative purposes only · Contact us to use it

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.

Potato + oniontop 3% of all pairs

Smell alikemoderate

Cooked together9,023 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Tomato + potatotop 5% of all pairs

Smell alikestrong

Cooked together2,798 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Tomato + ricetop 6% of all pairs

Smell alikestrong

Cooked together3,065 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Potato + ricetop 7% of all pairs

Smell alikestrong

Cooked together851 recipes

Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).
Tomato + oniontop 8% of all pairs

Smell alikemoderate

Cooked together20,633 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

Tomatoes: Add acidity and juicy body to the broth as they cook down.
Potatoes: Break down slightly as they cook, adding body and thickening the soup.
Onions: Release sweetness and savory depth into the broth during long simmering.
Rice: Releases starch as it cooks, helping thicken the soup slightly.