Why it works: Onion and barley match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and 1,166 recipes mention both. Both carry guaiacol, which smells smoky, sweet. The science ↓
The recipe
Serves 2Ingredients
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.
Heat the olive oil in a large saucepan over medium-low heat. Add the sliced onions and cook, stirring occasionally, for about 15 minutes until soft and golden.
Stir in the sliced garlic, chopped thyme and sugar. Cook for 5 more minutes, stirring often, until the onions are deep golden and caramelised.
Add the barley and the vegetable stock. Bring to a boil, then reduce the heat and simmer gently for about 20 minutes until the barley is tender.
Stir the sliced cavolo nero or kale into the soup and simmer for 3 to 4 minutes until wilted.
While the soup simmers, arrange the toasted baguette slices on a baking sheet and sprinkle each with grated Gruyère. Grill for 1 to 2 minutes until the cheese melts and bubbles.
Ladle the soup into bowls and top with the cheese croutons. Serve hot.
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 + barleytop 7% of all pairsAroma overlapstrongMentioned together1,166 recipes
Shared aroma: guaiacol (smoky, sweet).
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Onion + garlictop 1% of all pairsAroma overlapstrongMentioned together29,030 recipes
Shared aroma: furaneol (caramel, strawberry).
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Olive + garlictop 3% of all pairsAroma overlapmoderateMentioned together23,449 recipes
Shared aroma: linalool (floral, citrus).
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Garlic + kaletop 3% of all pairsAroma overlapmoderateMentioned together490 recipes
Shared aroma: coumarin (sweet, hay).
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Olive + thymetop 3% of all pairsAroma overlapstrongMentioned together4,641 recipes
Shared aroma: methyl 2-methylbutyrate (apple, fatty).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
Flavor stand-ins for the kale
How well each one fits the dish's main ingredients (olive, onion, garlic, thyme, sugar, barley, cheese):
- Tomatobetter flavor fit
- Potatobetter flavor fit
- Capsicumbetter flavor fit
- Kalethe original
Fit is the average pairing score against olive, onion, garlic, thyme, sugar, barley, cheese. 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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