Why it works: Parsley and shallot match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 3,737 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓
Croustade De Rognon De Veau
Ingredients
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare the filling
Chop the kidney and its fat together.
Fry the mushrooms in a little butter, then chop them and mix with the kidney.
Add parsley, shallot (if using), bread crumbs, pepper, salt, and egg to bind.
Assemble
Fry slices of bread in butter until golden, then shape them oval.
Spread the kidney mixture over the bread about an inch high.
Top with fine bread crumbs and drizzle with melted butter.
Bake and serve
Bake in a 400°F (200°C) oven until golden brown.
Serve hot, cutting each slice into three for guests.
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.
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Parsley + shallottop 1% of all pairsSmell alikestrongCooked together3,737 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Parsley + peppertop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Mushroom + shallottop 4% of all pairsSmell alikemoderateCooked together1,982 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Bread + buttertop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
-
Mushroom + buttertop 7% of all pairsSmell alikemoderateCooked together12,525 recipes
Shared aroma: trans-2-decenal (waxy, orange).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Veal kidney
- Forms the rich, savory body of the filling and gives the croustade its main flavor.
- Egg
- Binds the filling so it holds together when spread and baked.
- Bread crumbs
- Absorb moisture and help bind the filling, giving it a firmer texture.
- Fat from the kidney
- Adds richness and moisture so the filling stays tender rather than dry.
- Mushrooms
- Add earthy depth and moisture to the filling.
- Butter
- Browns the fried bread and topping, adding color and a nutty aroma.
The step that matters
Fry the bread until golden. The fried bread base must be sturdy and browned so it holds the moist filling without going soggy during baking. Butter browns through the Maillard reaction, which adds color and flavor.
Swap the shallot
The recipe marks shallot as optional. How well each one fits the dish's main ingredients (veal, mushroom, parsley, bread, pepper, egg, butter):
- Shallotthe original
- Capsicumfits about as well
- Asparagusfits about as well
- Carrotfits less well
Fit is the average pairing score against veal, mushroom, parsley, bread, pepper, egg, butter. 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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