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 ↓
Onions, with Beef Steak, Etc
Ingredients
Directions
Prepare
Remove a thin piece off each end of the onions and peel off the outer skins.
Cut the onions into slices about ¼ inch thick.
Cook
Melt the butter in a saucepan, then add the steak pieces and brown them.
Season with pepper and salt, then add the sliced onions and 3 ounces of butter.
Cover the saucepan and simmer gently until done, about 1.5 hours.
Serve
Arrange the steak on a hot dish.
Boil the onion gravy with walnut ketchup.
Pour it over the meat.
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.
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Pepper + walnuttop 13% of all pairsSmell alikemoderateCooked together3,039 recipes
Shared aroma: 2-nonenal (fatty, green).
-
Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
-
Butter + walnuttop 15% of all pairsSmell alikemoderateCooked together6,832 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
-
Onion + walnuttop 15% of all pairsSmell alikemoderateCooked together1,771 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Spanish onions
- Soften slowly in butter and release sweetness, forming the body of the gravy.
- Steak
- Provides the main protein; browning it first builds savoury flavour in the pan.
- Butter
- Carries heat evenly for browning and adds richness to the onions and gravy.
- Walnut ketchup
- Adds concentrated savoury, tangy depth to the onion gravy.
The step that matters
Simmer gently with the lid on. Low, covered heat cooks the steak through and softens the onions without scorching them. Rapid boiling would toughen the meat and burn the butter and sugars in the onions.
Swap the walnut
How well each one fits the dish's main ingredients (onion, butter, pepper, ketchup):
- Beansfits about as well
- Walnutthe original
- Sesamefits about as well
- Chestnutfits less well
Fit is the average pairing score against onion, butter, pepper, ketchup. 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.
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.
Tomato Soup526 recipes
Brown Bread461 recipes
Mutton Broth292 recipes
Yorkshire Pudding264 recipes