Why it works: Onion and olive are a kitchen classic. They rank in the top 5% of all ingredient pairs, and 26,431 recipes mention both. Both carry ethyl butyrate, which smells apple, fruity. The science ↓
The recipe
Ingredients
Contains: egg, milk (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare the onions
Preheat oven to 350°F.
In a large bowl, combine red and yellow onions, salt, pepper, and olive oil, and toss to coat well.
Preheat a grill pan over high heat.
Arrange onion wedges on the pan and cook until browned and tender underneath, about 5 minutes. Turn the onions and cook until very tender, about 7 minutes more.
Transfer the onions to a plate and set aside.
Make the frittata
In a large bowl, whisk eggs and cream until blended. Stir in cheese, salt, and pepper until smooth.
In a medium skillet, melt butter over medium heat.
Add rosemary and cook for 1 minute.
Pour the egg mixture into the skillet and fold gently to combine the rosemary and eggs.
Arrange the grilled onions on top of the egg mixture.
Transfer the skillet to the oven and bake for 15 minutes.
This recipe comes from the Recipes Wiki on Fandom and is licensed CC BY-SA 4.0. Our formatting and summaries are shared under the same licence.
Steps grouped into stages for easier reading; the method is the source's own.
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 + olivetop 5% of all pairsAroma overlapmoderateMentioned together26,431 recipes
Shared aroma: ethyl butyrate (apple, fruity).
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Olive + rosemarytop 3% of all pairsAroma overlapstrongMentioned together2,489 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
-
Pepper + rosemarytop 3% of all pairsAroma overlapstrongMentioned together2,324 recipes
Shared aroma: estragole (anise, licorice).
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Parmesan cheese + buttertop 3% of all pairsAroma overlapstrongMentioned together4,158 recipes
Shared aroma: guaiacol (smoky, sweet).
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Cream + buttertop 3% of all pairsAroma overlapstrongMentioned together41,494 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Set into a custard-like structure that gives the frittata its body.
- Heavy cream
- Adds moisture and richness, keeping the eggs tender rather than dry.
- Parmesan cheese
- Adds savory, salty flavor and helps the frittata brown and set.
- Red and yellow onions
- Grilling caramelizes their natural sugars, adding sweetness and deep flavor.
- Unsalted butter
- Adds fat and richness to the skillet and a rounded, buttery flavor.
The step that matters
Grilling the onions until very tender. Onions cooked only until lightly browned stay sharp and fibrous. Full browning and softening through heat develops sweetness and removes harsh raw bite before they go into the eggs.
Flavor stand-ins for the rosemary
How well each one fits the dish's main ingredients (onion, pepper, olive, egg, cream, parmesan cheese, butter):
- Garlicbetter flavor fit
- Parsleybetter flavor fit
- Celerybetter flavor fit
- Rosemarythe original
Fit is the average pairing score against onion, pepper, olive, egg, cream, parmesan cheese, butter. 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.
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