Name: Pickled Eggs
Ingredients: 6 hard-boiled eggs; 1 teaspoon cinnamon; 1 teaspoon allspice; 1 teaspoon mace; ½ cup cold water; 1 pint strong vinegar; beet juice (optional, for coloring)

Why it works: Cinnamon and allspice match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 5,536 recipes. Both carry estragole, which smells anise, licorice. The science ↓

Pickled Eggs

Ingredients

Directions

Prepare

Boil the eggs until hard and remove the shells.
Place cinnamon, allspice, and mace in a muslin bag and soak in cold water.

Make the pickling liquid

Boil the spice bag in the water; add more water if it boils away to maintain ½ cup.
Add 1 pint of strong vinegar to the spiced water.
For colored eggs, add beet juice to the mixture.

Pickle

Pour the mixture over the eggs.

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.

Cinnamon + allspicetop 1% of all pairs

Smell alikestrong

Cooked together5,536 recipes

Shared aroma: estragole (anise, licorice).
Allspice + macetop 7% of all pairs

Smell alikemoderate

Cooked together3,189 recipes

Shared aroma: methyleugenol (clove, spice).
Cinnamon + macetop 10% of all pairs

Smell alikemoderate

Cooked together3,611 recipes

Shared aroma: methyleugenol (clove, spice).
Allspice + vinegartop 13% of all pairs

Smell alikemoderate

Cooked together4,548 recipes

Shared aroma: 2-methylbutyl acetate (fruit).
Cinnamon + vinegartop 19% of all pairs

Smell alikemoderate

Cooked together5,187 recipes

Shared aroma: 4-ethyl-2-methoxyphenol (smoky, clove).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Eggs: Provide the protein base that absorbs the spiced vinegar flavor.
Vinegar: Acidity that flavors the eggs and keeps the pickling liquid tangy.
Cinnamon: Adds warm, sweet aroma to the pickling liquid.
Allspice: Adds warm, peppery aroma to the pickling liquid.
Mace: Adds a delicate, warm aroma to the pickling liquid.

The step that matters

Maintaining the water level while boiling the spice bag. If the water boils away too far, the spices become concentrated and the liquid's balance shifts. Keeping about ½ cup ensures the correct ratio of water to vinegar, so the pickling liquid tastes as intended.