Why it works: Sugar and walnut are a kitchen classic. They rank in the top 26% of all ingredient pairs, and cooks put them together in 7,147 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Walnut Sponge
Ingredients
Directions
The book gives no oven temperature. The 290°F (143°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the sponge
Combine sugar and glucose with enough water to dissolve in a large pot.
Cook the mixture until it reaches 290°F (143°C).
Remove from heat and stir in baking soda thoroughly.
Shape and finish
Pour the mixture onto a slab and spread it out as thin as possible.
Sprinkle the top with chopped walnut pieces.
Fold half of the batch over the other half.
Mark the surface with a caramel marker in both directions and break apart.
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 + walnuttop 26% of all pairsSmell alikemoderateCooked together7,147 recipes
Shared aroma: 2-nonenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Sugar
- Forms the brittle, crisp glass-like base of the candy as it cooks.
- Glucose
- Inhibits crystallization, keeping the candy smooth and preventing grainy sugar.
- Baking soda
- Releases carbon dioxide gas into the hot syrup, creating the sponge's airy, honeycomb texture.
- Chopped walnut pieces
- Adds crunch and nutty flavor that contrasts with the light, brittle candy.
The step that matters
Stirring in the baking soda. Baking soda must be mixed in quickly and thoroughly while the syrup is hot, because it reacts immediately to release gas. If it is stirred unevenly or too slowly, the candy rises unevenly and may have dense pockets or dark spots.
“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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