Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
String Beans
Ingredients
Directions
Prepare the beans
Remove the strings from the beans and cut them into 1‑inch pieces.
Wash the beans.
Cook the beans
Cook the beans in boiling water until tender.
Drain the beans and pour them over cream or a cream sauce.
Season the beans with butter, pepper, and salt.
Make the onion and butter base
Put 3 tablespoons of butter in the bottom of a kettle.
Cut 1 small onion into the butter.
Let the onion cook for a few minutes, stirring constantly.
Add the beans and pour over boiling water.
Cook slowly until nearly dry.
Season with salt and pepper to taste.
Note
Optionally, use diced bacon in place of butter.
Nutrition, whole recipe (rough)
What these numbers assume: 4 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Butter | 1 tbsp (14g) | 102 |
| Onion | 1 medium (110g) | 44 |
| Black Pepper | 1 tsp ground (2.3g) | 6 |
| Salt | 1 tsp (6g) | 0 |
One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.
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. See the original page.
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.
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
-
Butter + peppertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Beans (in the method)
- Form the main body of the dish, becoming tender when simmered in water.
- Butter
- Adds richness and carries flavor as the onion cooks and the beans are seasoned.
- Onion
- Softens in the butter to add sweetness and aromatic depth.
The step that matters
Cook slowly until nearly dry. Cooking gently lets the beans finish tender and concentrates their flavor in the butter and onion, while avoiding scorching the fat and sugars that would make the dish bitter or burnt.
Swap the onion
How well each one fits the dish's main ingredients (butter, pepper):
- Capsicumfits better
- Potatofits better
- Carrotfits about as well
- Onionthe original
Fit is the average pairing score against butter, 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.
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