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Potatoes a LA Duchesse

A French-style potato dish made with mashed potatoes, butter, egg yolks, and coated in breadcrumbs before frying.

From an old cookbook · modernised transcription
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Why it works: Potato and butter match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and 6,445 recipes mention both. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

The recipe

Ingredients

Contains: egg, milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)

Directions

Make the potato mixture

  1. Combine mashed potatoes, butter, egg yolks, and salt in a pot.

  2. Stir over low heat until well mixed.

  3. Remove from heat and let the mixture cool completely.

Shape and coat

  1. Dust a board with flour.

  2. Roll the cooled potato mixture into your desired shape.

  3. Beat the egg white with a little water in a bowl.

  4. Dip each potato shape into the egg white.

  5. Roll the dipped shape in bread or cracker crumbs.

Fry

  1. Heat lard in a pan.

  2. Fry the coated potato shapes 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 aroma chemistry they share, and how many recipes mention both.

  1. Potato + buttertop 6% of all pairs
    Aroma overlapstrong
    Mentioned together6,445 recipes

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

  2. Butter + breadtop 3% of all pairs
    Aroma overlapstrong
    Mentioned together27,145 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

  3. Egg + breadtop 6% of all pairs
    Aroma overlapstrong
    Mentioned together22,584 recipes

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

  4. Butter + flourtop 6% of all pairs
    Aroma overlaplow
    Mentioned together122,858 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Butter + eggtop 8% of all pairs
    Aroma overlapstrong
    Mentioned together118,511 recipes

    Shared aroma: nonanal (fat, citrus).

Butter and flour share little aroma chemistry, yet 122,858 recipes mention both: they likely work on texture and structure more than aroma.

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

What each ingredient does

Potatoes
Form the soft, fluffy body of the shapes once mashed and mixed.
Egg yolks
Enrich the mixture and help bind it so the shapes hold together.
Butter
Adds richness and moisture to the mashed potato mixture.
Egg white
Acts as a glue so the crumbs stick to the shaped potatoes.
Bread or cracker crumbs
Form a crisp outer coating that browns during frying.

The step that matters

Cool the mixture completely before shaping. A warm, soft mixture is sticky and hard to shape, and it can slump or break apart in the hot lard. Cooling firms it so the shapes keep their form.

“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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