Why it works: Syrup and sugar match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 5,842 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
Rock Sugar of All Colours
Ingredients
Directions
Make the coating
Boil the syrup in a pan until it is almost caramel.
In a small pot, mix the egg white with powdered sugar until very thick.
Remove the syrup from the heat and quickly stir in the egg and sugar mixture.
To vary the color, mix your choice of food coloring with the egg and sugar before adding to the syrup.
Set the rock
Pour the mixture into a sieve lined with paper before it cools.
Once cold, the mixture will harden like rock.
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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Syrup + sugartop 6% of all pairsSmell alikestrongCooked together5,842 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
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Syrup + eggtop 32% of all pairsSmell alikelowCooked together2,995 recipes
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Syrup
- Forms the sugar base that caramelizes and hardens as it cools.
- Egg white
- Adds protein structure that helps the mixture thicken and set firm.
- Powdered sugar
- Thickens the egg white into a stiff mixture and adds sweetness.
The step that matters
Stirring in the egg and sugar mixture. The syrup must be just hot enough to be nearly caramel, and the egg mixture should be added quickly. Adding it too slowly or at the wrong temperature can cause uneven setting or lumps, so the mixture must be stirred in promptly and evenly.
“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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