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Caramelised Onion & Barley Soup with Cheese Croutons

Nutty and nutritious barley adds real substance to this twist on classic French onion soup

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Why it works: Barley and cheese share more aroma than cooks usually use. They rank in the top 11% of all ingredient pairs, and 53 recipes mention both. Both carry 5-ethyl-3-hydroxy-4-methyl-2(5h)-furanone, which smells spice. The science ↓

The recipe

Serves 2
Prep10 min
Cook35 min

Ingredients

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.

  1. 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.

  2. Stir in the sliced garlic, chopped thyme and sugar. Cook for 5 more minutes, stirring often, until the onions are deep golden and caramelised.

  3. 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.

  4. Stir the sliced cavolo nero or kale into the soup and simmer for 3 to 4 minutes until wilted.

  5. 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.

  6. Ladle the soup into bowls and top with the cheese croutons. Serve hot.

By bbcgoodfood. Recipe from Open Recipes.

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.

  1. Barley + cheesetop 11% of all pairs
    Aroma overlapstrong
    Mentioned together53 recipes

    Shared aroma: 5-ethyl-3-hydroxy-4-methyl-2(5h)-furanone (spice).

  2. Onion + garlictop 1% of all pairs
    Aroma overlapstrong
    Mentioned together29,030 recipes

    Shared aroma: furaneol (caramel, strawberry).

  3. Olive + garlictop 3% of all pairs
    Aroma overlapmoderate
    Mentioned together23,449 recipes

    Shared aroma: linalool (floral, citrus).

  4. Garlic + kaletop 3% of all pairs
    Aroma overlapmoderate
    Mentioned together490 recipes

    Shared aroma: coumarin (sweet, hay).

  5. Olive + thymetop 3% of all pairs
    Aroma overlapstrong
    Mentioned 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):

  1. Tomatobetter flavor fit
  2. Potatobetter flavor fit
  3. Capsicumbetter flavor fit
  4. 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).