Why it works: Onion and celery are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 18,518 recipes. Both carry guaiacol, which smells smoky, sweet. The science ↓
Caramel
Ingredients
Directions
Make the caramel
Put the sugar in an iron pot over heat until it turns brown and begins to scorch.
When smoke appears, add the boiling water and stir until dissolved.
Bottle and store
Bottle the caramel and cork the bottle.
Store the caramel in a cool place for up to a year.
Flavour and finish
Add the sliced onion, celery seed, and bay leaves to the caramel and stir until browned.
Add water and boil briefly.
Strain before using.
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.
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Onion + celerytop 7% of all pairsSmell alikemoderateCooked together18,518 recipes
Shared aroma: guaiacol (smoky, sweet).
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Sugar + celerytop 33% of all pairsSmell alikelowCooked together4,794 recipes
Shared aroma: guaiacol (smoky, sweet).
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Sugar + oniontop 36% of all pairsSmell alikelowCooked together15,747 recipes
Shared aroma: guaiacol (smoky, sweet).
Sugar and onion barely smell alike, yet cooks put them together in 15,747 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Granulated sugar
- Caramelizes under heat to give the liquid its brown color and deep, bitter-sweet flavor.
- Boiling water
- Dissolves the scorched sugar into a pourable liquid and halts further browning.
- Sliced onion
- Adds savory aroma and flavor to the caramel.
- Celery seed
- Adds a warm, herbal aroma to the liquid.
- Bay leaves
- Contribute a subtle herbal aroma as they steep in the liquid.
The step that matters
Scorching the sugar. Sugar moves from amber to bitter burnt within seconds, so the color and flavor depend on stopping at the right point. Adding boiling water when smoke appears halts the reaction but can spatter and release hot steam, so add it carefully.
Swap the onion
How well each one fits the dish's main ingredients (sugar, celery):
- Mustardfits better
- Carrotfits better
- Parsnipfits better
- Onionthe original
Fit is the average pairing score against sugar, celery. 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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