Name: Almond Rock
Ingredients: 1 lb brown sugar; 1 teacup water (about 1 cup); ½ lb almonds; Lemon extract to flavor

Why it works: Almond and lemon match in chemistry and in kitchens. They rank in the top 10% of all ingredient pairs, and cooks put them together in 5,655 recipes. Both carry eucalyptol, which smells eucalyptus, herbal. The science ↓

Almond Rock

Ingredients

1 lb brown sugar
1 teacup water (about 1 cup)
½ lb almonds
Lemon extract to flavor

Directions

Make the candy

In a saucepan, combine brown sugar and water.
Cook until the thermometer reads 290°F (143°C) or until a drop in cold water cracks like an eggshell.
Remove from heat and flavor with lemon extract.

Add the almonds and set

Clean the almonds by rubbing them between two cloths without blanching.
Slightly warm the almonds and add them to the candy mixture.
Pour the mixture into oiled pans, about 2 inches thick.
Cut into pieces with a sharp, oiled knife before it cools.

Recipe from a historical cookbook (Internet Archive).

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.

Almond + lemontop 10% of all pairs

Smell alikestrong

Cooked together5,655 recipes

Shared aroma: eucalyptol (eucalyptus, herbal).
Sugar + almondtop 18% of all pairs

Smell alikemoderate

Cooked together15,679 recipes

Shared aroma: 1-penten-3-one (fish, pungent).
Sugar + lemontop 18% of all pairs

Smell alikelow

Cooked 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

Brown sugar: Provides the bulk of the candy and its sweet, caramel-like flavor as it cooks.
Water: Dissolves the sugar so it can be cooked smoothly into a syrup.
Almonds: Add crunch and nutty flavor to the brittle-like candy.

The step that matters

Cook to 290°F (143°C), or to the cold-water crack test. Sugar syrup hardens as its temperature rises and water evaporates. Stopping short leaves a candy that is soft or sticky, while overcooking makes it bitter and brittle enough to break teeth. The thermometer or cold-water test shows when the syrup is at the hard-crack stage.