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Duchess Potatoes

A baked potato dish with butter, egg yolk, pepper, salt, and parsley.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Pepper and parsley match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓

Duchess Potatoes

Oven, in the book's wordsA quick oven

Ingredients

Directions

The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.

Prepare

  1. Boil and mash the potatoes.

  2. Add the butter, parsley, pepper, salt, and part of the egg yolk.

Shape and bake

  1. Roll out the mixture and cut into squares or roll into balls.

  2. Brush the tops with the remaining egg yolk.

  3. Bake in a 400°F (200°C) oven until browned.

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. Pepper + parsleytop 2% of all pairs
    Smell alikestrong
    Cooked together34,122 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  2. Potato + parsleytop 5% of all pairs
    Smell alikemoderate
    Cooked together2,855 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  3. Potato + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together8,305 recipes

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

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

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

  5. Butter + parsleytop 15% of all pairs
    Smell alikemoderate
    Cooked together28,563 recipes

    Shared aroma: trans-2-hexenal (green, leafy).

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

What each ingredient does

Potatoes
Form the bulk of the dish and, once mashed, give a soft, pipeable structure.
Butter
Adds fat and richness, making the mashed potato smooth and tender.
Egg yolk
Binds the mash so it holds its shape, and its brushed-on portion helps the tops brown.

The step that matters

Brush the tops with the remaining egg yolk. Egg yolk contains proteins and sugars that brown in the oven, so an even coat gives an even golden colour. Uneven brushing leaves pale patches.

Swap the potato

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

  1. Shallotfits about as well
  2. Chivefits about as well
  3. Carrotfits about as well
  4. Potatothe original

Fit is the average pairing score against butter, pepper, egg, parsley. 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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