Why it works: Cream and butter are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 41,516 recipes. Both carry delta-dodecalactone, which smells sweet, creamy. The science ↓
Butter Scotch
Ingredients
Directions
The book gives no oven temperature. The 300°F (150°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the toffee
Melt the sugar in the water over medium heat, stirring occasionally.
Add the cream of tartar and boil until the mixture reaches 300°F (150°C).
Remove the pan from the heat and add the butter in small pieces, stirring until melted.
Return the pan to the heat and add lemon flavoring; let it boil until fully combined.
Cool and cut
Pour the mixture into frames and let it cool slightly.
When partly cold, mark into small squares with a cutter.
Once completely cool, divide the squares and wrap each in wax paper.
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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Cream + buttertop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Sugar + creamtop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
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Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Sugar + buttertop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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
- White sugar
- Provides the sweetness and forms the body of the candy as it cooks down.
- Cream of tartar
- Acidifies the syrup, helping prevent crystallisation for a smoother texture.
- Fresh butter
- Adds richness and fat, softening the bite and giving a creamy flavour.
The step that matters
Boil to 300°F (150°C). The syrup must reach the hard-crack stage to set firm once cooled. Undercooking leaves a sticky candy, while overcooking makes it brittle and possibly scorched.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, cream, butter):
- Vanillafits better
- Strawberryfits better
- Coconutfits better
- Lemonthe original
Fit is the average pairing score against sugar, cream, butter. 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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