Why it works: Mustard and vinegar are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 14,067 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Cheese Sandwiches
Ingredients
Directions
Make the filling
Crumble the yolk of the hard boiled egg into a small bowl.
Add melted butter and mix until smooth.
Incorporate salt, pepper, mustard, and grated cheese, mixing well.
Stir in vinegar to achieve the desired thickness.
Assemble
Spread the mixture between biscuits, bread, or oat cakes.
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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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Cheese + buttertop 8% of all pairsSmell alikemoderateCooked together7,962 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Cheese + mustardtop 11% of all pairsSmell alikemoderateCooked together1,805 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Cheese + vinegartop 12% of all pairsSmell alikemoderateCooked together922 recipes
Shared aroma: 3-methylbutanol (malty, whiskey).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Hard boiled egg yolk
- Its crumbled yolk gives the filling a soft, rich body that holds the mixture together.
- Common cheese
- Grated cheese supplies the main flavour and bulk of the filling.
- Melted butter
- Fat coats the crumbs and cheese, making the filling smooth and spreadable.
- Vinegar or cold water
- Liquid loosens the mixture, and its thickness is adjusted to the cook's preference.
The step that matters
Stir in vinegar to achieve the desired thickness. Liquid should be added gradually. Too much makes the filling runny and hard to spread, while too little leaves it stiff and crumbly.
Swap the mustard
How well each one fits the dish's main ingredients (egg, cheese, pepper, butter, vinegar):
- Capsicumfits about as well
- Mustardthe original
- Asparagusfits less well
- Potatofits less well
Fit is the average pairing score against egg, cheese, pepper, butter, vinegar. 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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