Why it works: Tomato and onion are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 20,633 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Boston Roast
Ingredients
Directions
The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Mash the beans or grind them using a meat grinder.
Add the grated cheese and enough bread crumbs to form a stiff mixture.
Shape the mixture into a roll.
For added flavor, sauté chopped onions in butter and water before adding.
Bake and serve
Bake in a moderate oven at 350°F (175°C), basting occasionally with butter and water.
Serve with tomato sauce.
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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Tomato + oniontop 8% of all pairsSmell alikemoderateCooked together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Cheese + buttertop 8% of all pairsSmell alikemoderateCooked together7,962 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Kidney beans + tomatotop 12% of all pairsSmell alikemoderateCooked together821 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Cheese + tomatotop 13% of all pairsSmell alikemoderateCooked together2,896 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + saucetop 15% of all pairsSmell alikelowCooked together15,338 recipes
Shared aroma: ethanol (alcoholic, ethereal).
Butter and sauce barely smell alike, yet cooks put them together in 15,338 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
- Kidney beans
- Provide the bulk and body of the roll, holding the mixture together once mashed.
- Grated cheese
- Adds richness and flavor, and helps bind the mixture as it melts.
- Bread crumbs
- Absorb moisture and help the mixture hold a stiff, shapeable form.
- Butter
- Adds fat and helps the outside brown while the roll bakes.
The step that matters
Shape the mixture into a roll. The mixture must be stiff enough to hold its shape. Too much moisture from the beans or butter can make it slump or fall apart in the oven, so bread crumbs should be added until it firms up.
Swap the onion
The recipe marks onion as optional. How well each one fits the dish's main ingredients (kidney beans, cheese, butter, tomato, sauce):
- Capsicumfits better
- Potatofits about as well
- Onionthe original
- Mustardfits about as well
Fit is the average pairing score against kidney beans, cheese, butter, tomato, sauce. 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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