Name: Yorkshire Toffee
Ingredients: 4 lbs glucose; 2 lbs white sugar; 2 lbs yellow sugar; 1 qt cream; 1 lb butter; ½ oz lemon extract

Why it works: Cream and butter are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 41,516 recipes. Both carry delta-dodecalactone, which smells sweet, creamy. The science ↓

Yorkshire Toffee

Ingredients

Directions

Cook the toffee

In a kettle, combine glucose, white sugar, yellow sugar, and cream.
Cook the mixture until it reaches 250°F (120°C).
Add butter and lemon extract, then continue cooking until it reaches 260°F (130°C).

Set and cut

Pour the mixture onto a greased slab to a thickness of caramels.
Once set, cut into pieces measuring 2x4 inches.

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.

Cream + buttertop 8% of all pairs

Smell alikemoderate

Cooked together41,516 recipes

Shared aroma: delta-dodecalactone (sweet, creamy).
Sugar + creamtop 9% of all pairs

Smell alikemoderate

Cooked together43,450 recipes

Shared aroma: 2,3-butanedione (butter, sweet).
Butter + lemontop 16% of all pairs

Smell alikemoderate

Cooked together41,227 recipes

Shared aroma: 3-hexenal (apple, fruity).
Sugar + buttertop 17% of all pairs

Smell alikemoderate

Cooked together98,233 recipes

Shared aroma: guaiacol (smoky, sweet).
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

Glucose: Inhibits sugar crystallization, keeping the toffee smooth and preventing grainy texture.
White sugar: Provides sweetness and forms the structure that sets as the mixture cools.
Yellow sugar: Adds sweetness and a deeper caramel flavor as the sugars cook.
Cream: Adds fat and moisture, giving the toffee a rich, softer bite.
Butter: Adds fat for richness and a tender, melt-in-the-mouth texture.

The step that matters

Cooking to 260°F (130°C) after adding butter. The final temperature determines how firm the toffee sets. Undercooking leaves it soft and sticky, while overcooking makes it hard and brittle. Stirring and watching the thermometer keeps the sugar from scorching.