Why it works: Sugar and lemon are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Barley Sugar
Ingredients
Directions
Make the syrup
Heat clarified sugar until it reaches the crack stage, where it breaks with a slight noise when dipped with a finger.
Add 2-3 drops of lemon juice or a little vinegar to prevent graining.
Remove from heat immediately and dip the pan into cold water to stop burning.
Set and cut
Let it cool slightly, then pour onto a marble surface greased with oil.
Once set, cut the sugar into small pieces for use.
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 + 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
- Clarified sugar
- Forms the glassy, hard candy structure when heated to the crack stage and set.
- Lemon juice or vinegar
- Acid helps prevent sugar crystals from forming, keeping the candy smooth and clear.
The step that matters
Removing from heat immediately at the crack stage. Sugar keeps darkening and can burn within seconds past the crack stage. Dipping the pan in cold water halts the cooking so the candy stays pale and sweet-tasting rather than bitter.
“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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