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Dessert

Boston Cream Bar

Boston Cream Bar is a confection made from sugar, glucose, water, flavoring, and coconut or nut meats, set and cut into squares.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Vanilla and coconut match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 2,294 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓

Boston Cream Bar

Ingredients

Directions

The book gives no oven temperature. The 244°F (118°C) in the steps was added when the recipe was transcribed, as a starting point.

Make the syrup

  1. Dissolve sugar and glucose in water.

  2. Cook the mixture to 244°F (118°C).

Cool and shape

  1. Pour onto a damp slab.

  2. Add flavoring and color as desired.

  3. Sprinkle coconut or nut meats on top.

  4. Cream the mixture immediately as it starts to set.

  5. Press it evenly into paper-lined pans.

  6. Once cold, turn out, peel off the paper, and cut into small squares.

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. Vanilla + coconuttop 1% of all pairs
    Smell alikestrong
    Cooked together2,294 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

  2. Vanilla + chocolatetop 5% of all pairs
    Smell alikemoderate
    Cooked together10,020 recipes

    Shared aroma: sotolon (curry, maple).

  3. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  4. Chocolate + coconuttop 9% of all pairs
    Smell alikemoderate
    Cooked together1,107 recipes

    Shared aroma: gamma-nonanolactone (coconut, sweet).

  5. Sugar + chocolatetop 13% of all pairs
    Smell alikemoderate
    Cooked together15,404 recipes

    Shared aroma: guaiacol (smoky, sweet).

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 recipes: they 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

Sugar
Provides the bulk of the sweetness and the crystalline structure that sets the bar.
Glucose
Interferes with sugar crystallisation, keeping the candy smooth and less grainy.
Coconut or nut meats
Adds crunch and texture to the surface of the finished bar.

The step that matters

Creaming as the mixture starts to set. Once the cooked syrup begins to set, it must be worked immediately, because cooling sugar mixtures crystallise quickly. Working it at this point produces a smooth, creamy texture rather than a hard or grainy one.

Swap the coconut

How well each one fits the dish's main ingredients (sugar, vanilla, chocolate):

  1. Coconutthe original
  2. Cherryfits about as well
  3. Figfits about as well
  4. Raspberryfits about as well

Fit is the average pairing score against sugar, vanilla, chocolate. 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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