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Duchess Potatoes

A baked mashed potato dish flavored with butter, milk, pepper, salt, and dry mustard.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Duchess Potatoes

Oven, in the book's wordsA hot oven

Ingredients

Directions

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

Make the mixture

  1. Melt butter or dripping in a little milk, adjusting quantities based on the amount of potato.

  2. Add pepper, coarse sea salt, and a pinch of dry mustard; beat thoroughly.

Bake

  1. Butter a baking bag thickly, fill it with the potato mixture, and cook in a hot oven at 400°F (200°C) for 10 minutes.

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. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

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

  2. Potato + mustardtop 7% of all pairs
    Smell alikemoderate
    Cooked together1,340 recipes

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

  3. Pepper + mustardtop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

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

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

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

  5. Potato + milktop 9% of all pairs
    Smell alikemoderate
    Cooked together3,611 recipes

    Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).

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

What each ingredient does

Cold mashed potatoes
Provide the bulk and structure of the dish, setting as they bake.
Butter or dripping
Adds fat for richness and flavour, and helps the surface brown.
Milk
Adds moisture so the potato mixture becomes smooth and easy to pipe.

The step that matters

Baking in a hot oven. The potato mixture needs enough heat to dry its surface and brown it. If the oven is too cool, the potato stays pale and soft and does not set well.

Swap the mustard

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

  1. Capsicumfits better
  2. Asparagusfits better
  3. Tomatofits better
  4. Mustardthe original

Fit is the average pairing score against potato, butter, milk, pepper. 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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