Name: Egg Sauce
Ingredients: 2 or 3 hard-boiled eggs; ½ cup melted butter; mustard (optional)

Why it works: Egg and butter are a kitchen classic. They rank in the top 17% of all ingredient pairs, and cooks put them together in 118,967 recipes. Both carry decanal, which smells soap, orange peel. The science ↓

Egg Sauce

Ingredients

2 or 3 hard-boiled eggs
½ cup melted butter
mustard (optional)

Directions

Prepare

Boil the eggs until hard, then remove the shells.
Separate the egg whites and yolks, chopping them into small pieces but not too fine.
Mix the chopped yolks and whites together thoroughly.

Make the sauce

Combine the egg mixture with the melted butter.
Serve with salt fish and add mustard if desired.

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.

Egg + buttertop 17% of all pairs

Smell alikemoderate

Cooked together118,967 recipes

Shared aroma: decanal (soap, orange peel).
Butter + mustardtop 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

Hard-boiled eggs: Provide the main body of the sauce, with chopped yolk and white giving it a thick, spoonable texture.
Melted butter: Adds fat and richness, coating the egg pieces and smoothing the sauce.
Mustard: Adds sharp, pungent flavour that cuts through the richness of the egg and butter.

Flavor stand-ins for the mustard

The recipe marks mustard as optional. How well each one fits the dish's main ingredients (egg, butter):

Asparagusbetter flavor fit
Chivebetter flavor fit
Leekbetter flavor fit
Mustardthe original

Fit is the average pairing score against egg, butter. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).

“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.