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Potatoes Duchesse

Potatoes Duchesse are mashed potatoes mixed with butter and egg yolks, piped into decorative shapes and baked until golden.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Potato and butter are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 6,456 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Potatoes Duchesse

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare

  1. Mix mashed potatoes with butter and egg yolks until smooth.

  2. Transfer the mixture to a piping bag fitted with a star-shaped tip.

Pipe and bake

  1. Pipe the mixture onto a buttered baking pan in decorative shapes.

  2. Brush the tops with egg wash.

  3. Bake in a 350°F (175°C) oven until golden brown.

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.

  1. Potato + buttertop 13% of all pairs
    Smell alikemoderate
    Cooked together6,456 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  2. Butter + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

  3. Potato + eggtop 29% of all pairs
    Smell alikemoderate
    Cooked together4,978 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

Mashed potatoes
Form the body of the piped shapes, giving bulk and a soft, fluffy texture.
Butter
Adds richness and moisture, making the potato mixture smooth and tender.
Egg yolks
Add richness and help the piped shapes set and hold their form when baked.
Egg wash
Promotes browning on the surface, giving the golden color after baking.

The step that matters

Brushing the tops with egg wash. Egg wash is what browns the surface, so an uneven or missing coat leaves pale patches. Apply it evenly without letting it pool or drip onto the pan, where it can harden.

Swap the potato

How well each one fits the dish's main ingredients (butter, egg):

  1. Asparagusfits better
  2. Chivefits better
  3. Leekfits about as well
  4. Potatothe original

Fit is the average pairing score against butter, egg. 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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