Why it works: Tomato and cheese match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and 2,892 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
The recipe
Ingredients
Contains: milk, wheat (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 oven to 425°F (220°C). Toss the tomato halves with 2 tablespoons of the olive oil, salt and black pepper, then arrange cut side up on a sheet pan with the thyme sprig. Roast 25 to 30 minutes until the edges are charred.
While the tomatoes roast, heat the remaining 1 tablespoon olive oil in a large pot over medium heat. Add the chopped onion and red bell pepper and cook about 8 minutes until soft.
Stir in the garlic, red pepper flakes and sugar and cook 1 minute. Add the roasted tomatoes with their juices and 1 cup vegetable broth. Simmer 10 minutes, then remove the thyme sprig.
Blend the soup until smooth with an immersion blender. Thin with more broth to the desired consistency, season with salt and pepper, and stir in the parsley.
Spread the softened butter on one side of each sourdough slice. Divide the cheese slices among 4 sandwiches, pressing the cheese between the bread with the buttered sides out.
Cook the sandwiches in a skillet over medium-low heat about 3 minutes per side, until golden and the cheese has melted. Let rest 2 minutes, then cut into bite-size croutons.
Ladle the soup into bowls, top with the grilled cheese croutons, and sprinkle with the basil, chives and chopped thyme.
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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Tomato + cheesetop 6% of all pairsAroma overlapstrongMentioned together2,892 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + olivetop 1% of all pairsAroma overlapstrongMentioned together14,164 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Parsley + thymetop 1% of all pairsAroma overlapstrongMentioned together9,057 recipes
Shared aroma: cuminaldehyde (Spicy, cumin).
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Onion + garlictop 1% of all pairsAroma overlapstrongMentioned together29,030 recipes
Shared aroma: furaneol (caramel, strawberry).
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Pepper + parsleytop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (tomato, olive, pepper, garlic, sugar, parsley, thyme):
- Capsicumbetter flavor fit
- Carrotbetter flavor fit
- Potatobetter flavor fit
- Onionthe original
Fit is the average pairing score against tomato, olive, pepper, garlic, sugar, parsley, thyme. 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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