Why it works: Sugar and milk are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 77,875 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Common Mustard
Ingredients
Directions
Place the mustard powder on a plate.
Add salt and gradually mix in boiling water until smooth.
Rub with a broad-bladed knife or wooden spoon until perfectly smooth.
For a milder mustard, substitute sugar for salt and use boiling milk instead of water.
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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Sugar + milktop 18% of all pairsSmell alikelowCooked together77,875 recipes
Shared aroma: 2-nonenal (fatty, green).
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Mustard + sugartop 19% of all pairsSmell alikemoderateCooked together8,424 recipes
Shared aroma: guaiacol (smoky, sweet).
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Mustard + milktop 25% of all pairsSmell alikemoderateCooked together2,658 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
Sugar and milk barely smell alike, yet cooks put them together in 77,875 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
- Mustard powder
- Provides the main body and sharp flavour once hydrated into a paste.
- Boiling water
- Hydrates the mustard powder so it forms a smooth, spreadable paste.
- Sugar
- In the milder version, adds sweetness that softens the mustard's bite.
- Boiling milk
- In the milder version, adds richness and softens the mustard's sharpness.
The step that matters
Gradually mixing in the boiling water. Adding the liquid slowly lets each mustard particle hydrate evenly, which prevents lumps. Hot water also quickly halts the enzyme that creates pungency, so the flavour mellows as the paste forms.
Swap the mustard
The recipe marks mustard as optional. How well each one fits the dish's main ingredients (sugar, milk):
- Sweet potatofits better
- Capsicumfits better
- Potatofits better
- Mustardthe original
Fit is the average pairing score against sugar, milk. 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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