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Boston Baked Beans

A baked bean dish with navy beans, molasses, mustard, salt, butter, and water, cooked slowly in an oven.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Beans and mustard match in chemistry and in kitchens. They rank in the top 4% of all ingredient pairs, and cooks put them together in 852 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Boston Baked Beans

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 the beans

  1. Pick over and wash the beans, then soak them overnight in enough water to cover.

  2. In the morning, place the beans in a kettle with fresh water and boil for 15 minutes.

  3. Skim the water and transfer the beans to a clay crock.

Bake

  1. Add molasses, mustard, salt, butter, and enough water to cover the beans.

  2. Cover the crock.

  3. Place the crock in a 350°F (175°C) oven.

  4. Cook all day, checking every 30 minutes to ensure water is visible at the top of the beans.

  5. In the last hour, do not add more water if the oven is moderate.

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. Beans + mustardtop 4% of all pairs
    Smell alikestrong
    Cooked together852 recipes

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

  2. Beans + buttertop 19% of all pairs
    Smell alikemoderate
    Cooked together2,799 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  3. Mustard + buttertop 22% of all pairs
    Smell alikemoderate
    Cooked together8,003 recipes

    Shared aroma: guaiacol (smoky, sweet).

  4. Molasses + mustardtop 23% of all pairs
    Smell alikelow
    Cooked together468 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  5. Beans + molassestop 26% of all pairs
    Smell alikelow
    Cooked together491 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

What each ingredient does

Navy beans
Form the bulk of the dish, becoming tender and creamy as they slowly cook.
Molasses
Adds sweetness, dark color, and a deep caramel-like flavor during the long bake.
Butter
Adds fat for richness and a smoother, more rounded texture.
Mustard
Adds a sharp, savory note that balances the sweetness of the molasses.

The step that matters

Keeping water level up during the bake. Beans exposed above the liquid can dry out and toughen while the rest cooks, so the water level must be checked regularly. Adding water in the final hour is avoided because it dilutes the thickening sauce.

Swap the mustard

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

  1. Sweet potatofits better
  2. Mustardthe original
  3. Potatofits about as well
  4. Welsh onionfits about as well

Fit is the average pairing score against beans, molasses, butter. 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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