Why it works: Onion and potato match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 9,019 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
The recipe
6 servingsIngredients
Contains: milk (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Method written by CompKitchen from the ingredient list. Not the original author's method, not kitchen-tested.
Melt about two-thirds of the butter in a large skillet over medium heat. Add the sliced onions and brown sugar, stir, and cook 20 minutes, stirring often, until soft and golden.
Preheat the oven to 375°F (190°C). Use the remaining butter to lightly grease a 9x13-inch baking dish.
Layer one-third of the sliced potatoes in the dish, spread one-third of the caramelized onions over them, and sprinkle with one-third of the rosemary. Repeat twice, ending with potatoes.
Pour the heavy cream evenly over the layers and dot the top with any butter left in the skillet.
Cover the dish tightly with foil and bake for 40 minutes.
Uncover and bake 45 minutes more, until the potatoes are tender when pierced with a knife and the top is golden.
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.
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Onion + potatotop 2% of all pairsAroma overlapstrongMentioned together9,019 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Potato + rosemarytop 3% of all pairsAroma overlapstrongMentioned together708 recipes
Shared aroma: beta-damascenone (apple, rose).
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Butter + creamtop 3% of all pairsAroma overlapstrongMentioned together41,494 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Sugar + creamtop 5% of all pairsAroma overlapmoderateMentioned together43,437 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
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Butter + potatotop 6% of all pairsAroma overlapstrongMentioned together6,445 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
Flavor stand-ins for the rosemary
How well each one fits the dish's main ingredients (onion, sugar, butter, potato, cream):
- Garlicbetter flavor fit
- Nutmegbetter flavor fit
- Celerybetter flavor fit
- Rosemarythe original
Fit is the average pairing score against onion, sugar, butter, potato, cream. 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).
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