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Boston Hash

A baked dish of mashed potatoes and finely chopped meat, topped with milk, butter, salt, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Milk and butter 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 ↓

Boston Hash

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. Preheat the oven to 400°F (200°C).

Layer and bake

  1. Place a layer of cold mashed potatoes in a baking dish.

  2. Add a layer of finely chopped meat on top of the potatoes.

  3. Add another layer of cold mashed potatoes on top of the meat.

  4. Pour the scant cup of milk over the layers.

  5. Dot the top with butter.

  6. Season with coarse sea salt and pepper.

  7. Bake until 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. Milk + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

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

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

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

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

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

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

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

  5. Potato + meattop 14% of all pairs
    Smell alikemoderate
    Cooked together786 recipes

    Shared aroma: 1-octen-3-one (mushroom, metallic).

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

What each ingredient does

Cold mashed potatoes
Form the bulk of the dish and set into a soft, creamy layer as they bake.
Finely chopped meat
Provides savory flavour and substance between the potato layers.
Milk
Adds moisture so the layers become tender and help the top brown evenly.
Butter
Adds fat that enriches the flavour and promotes browning on the surface.

The step that matters

Bake until brown. Baking long enough lets the surface brown through Maillard reactions, which add flavour and colour. Stopping too early leaves the top pale and the layers under-heated.

Swap the potato

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

  1. Potatothe original
  2. Capsicumfits about as well
  3. Asparagusfits less well
  4. Tomatofits less well

Fit is the average pairing score against meat, milk, butter, 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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