Name: Mushroom-toast, or Croute Aux Champignons
Ingredients: 1 quart small, just-opened mushrooms; 3 to 4 ounces fresh butter; ¼ teaspoon pounded mace; a pinch of cayenne pepper; 1 small dessertspoonful flour; ½ pint gravy or good beef broth; salt to taste; squeeze of lemon juice; 1 slice bread, about 1¼ inches thick

Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Mushroom-toast, or Croute Aux Champignons

Ingredients

Directions

Prepare

Cut the stems from the mushrooms, peel them, and remove the fur.

Make the mushroom sauce

Melt the butter in a saucepan over low heat.
Add the mushrooms, mace, and cayenne; stew for 10 to 15 minutes, stirring often.
Add the flour and stir until lightly browned.
Gradually pour in the gravy or broth and simmer for 2 minutes.
Season with salt and lemon juice.

Toast and serve

Fry the bread in butter until light brown, slightly hollowing it out first.
Serve the mushroom mixture on the toasted bread.

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.

Pepper + lemontop 3% of all pairs

Smell alikestrong

Cooked together27,047 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Mushroom + beeftop 4% of all pairs

Smell alikemoderate

Cooked together3,232 recipes

Shared aroma: 2,4-nonadienal (fatty, green).
Butter + breadtop 7% of all pairs

Smell alikemoderate

Cooked together27,232 recipes

Shared aroma: delta-decalactone (sweet, creamy).
Mushroom + buttertop 7% of all pairs

Smell alikemoderate

Cooked together12,525 recipes

Shared aroma: trans-2-decenal (waxy, orange).
Pepper + beeftop 10% of all pairs

Smell alikemoderate

Cooked together18,971 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

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

What each ingredient does

Mushrooms: Provide the main bulk and earthy flavour, softening as they stew in butter.
Butter: Carries the flavour of the dish and browns the bread for a golden crust.
Flour: Thickens the cooking liquid into a smooth sauce and helps it cling to the mushrooms.
Gravy or beef broth: Adds savoury depth and liquid that turns the mushrooms into a sauce.
Bread: Forms a crisp base that soaks up the mushroom sauce without going soggy.

The step that matters

Stirring the flour until lightly browned. Flour must cook in the fat long enough to lose its raw taste and thicken evenly; stopping too early leaves a pasty flavour, while over-browning turns it bitter and dark.

Swap the mace

How well each one fits the dish's main ingredients (mushroom, butter, pepper, flour, beef, lemon, bread):

Thymefits better
Parsleyfits better
Marjoramfits better
Macethe original

Fit is the average pairing score against mushroom, butter, pepper, flour, beef, lemon, bread. Candidates are from the same food group and used in at least 100 recipes.

“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.

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Mushroom-toast, or Croute Aux Champignons