Name: Deviled Eggs
Ingredients: 4 hard-boiled eggs; ¼ teaspoon mustard; ¼ teaspoon salt; ⅛ teaspoon pepper; 2 teaspoons melted butter

Why it works: Mustard and pepper are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 15,430 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Deviled Eggs

Ingredients

Directions

Prepare the eggs

Cool the hard‑boiled eggs in cold water to prevent discoloration.
Remove the shells and cut the eggs in half crosswise.
Remove the yolks and mash them with a fork.

Make the filling

Mix the mustard, salt, pepper, and melted butter with the yolks.
Fill the egg whites with the yolk mixture.

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.

Mustard + peppertop 9% of all pairs

Smell alikemoderate

Cooked together15,430 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Egg + buttertop 17% of all pairs

Smell alikemoderate

Cooked together118,967 recipes

Shared aroma: decanal (soap, orange peel).
Pepper + buttertop 21% of all pairs

Smell alikemoderate

Cooked together85,593 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Mustard + buttertop 22% of all pairs

Smell alikemoderate

Cooked together8,003 recipes

Shared aroma: guaiacol (smoky, sweet).
Egg + mustardtop 28% of all pairs

Smell alikemoderate

Cooked together9,210 recipes

Shared aroma: (e)-2-octenal (fatty, green).

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

What each ingredient does

Eggs: Provide the egg whites that hold the filling and the yolks that form its base.
Butter: Adds richness and a smooth, moist texture to the mashed yolks.
Mustard: Adds sharp, tangy flavor that balances the richness of the yolks.

The step that matters

Cool the hard‑boiled eggs in cold water. Cold water stops the cooking quickly, which keeps the yolks from overcooking and prevents the grey-green ring that forms between yolk and white when eggs cool slowly. Chilled eggs are also easier to peel cleanly.