Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Russian Toffee
Ingredients
Directions
Cook the toffee
In a saucepan, combine the sugar, butter, treacle, and Swiss milk.
Cook over medium heat, stirring constantly until the mixture reaches a soft ball stage.
Set and serve
Pour the mixture into a greased pan and let it cool.
Once cooled, cut into pieces and serve.
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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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Sugar + buttertop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
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Sugar + milktop 18% of all pairsSmell alikelowCooked together77,875 recipes
Shared aroma: 2-nonenal (fatty, green).
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
- Granulated sugar
- Provides sweetness and, as it cooks to a higher temperature, sets into a firm, chewy toffee.
- Butter
- Adds fat for a rich flavour and a smooth, tender texture.
- Treacle
- Adds deep caramel-like flavour and darkens the colour of the toffee.
- Swiss milk
- Adds milk solids that brown during cooking and give a creamy, softer bite.
The step that matters
Cooking to the soft ball stage with constant stirring. The final texture depends on how much water has boiled off, so the sugar must reach the soft ball stage before cooling. Constant stirring keeps the mixture even and prevents the sugar from scorching or crystallising on the base of the pan.
“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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