Name: Boston Brown Bread
Ingredients: 1 cup rye meal; ½ tablespoon baking soda; 1 cup granulated cornmeal; 1 teaspoon salt; 1 cup Graham flour; ¼ cup molasses; 2 cups sour milk, or 1½ cups sweet milk or water

Why it works: Rye and flour match in chemistry and in kitchens. They rank in the top 8% of all ingredient pairs, and cooks put them together in 1,320 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Boston Brown Bread

Ingredients

Directions

Prepare

Mix and sift the dry ingredients together.
Add the molasses and milk, stirring until well combined.
Pour the mixture into a well-buttered mold, filling it no more than two-thirds full.
Cover the mold with a buttered lid and tie it down with string.

Steam

Steam for three and a half hours in a kettle with boiling water, ensuring the water comes halfway up the mold.

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.

Rye + flourtop 8% of all pairs

Smell alikestrong

Cooked together1,320 recipes

Shared aroma: isobutyraldehyde (malty, green).
Rye + milktop 12% of all pairs

Smell alikemoderate

Cooked together918 recipes

Shared aroma: ethyl 2-methylbutyrate (fruity, apple).
Flour + milktop 14% of all pairs

Smell alikelow

Cooked together78,219 recipes

Shared aroma: isobutyraldehyde (malty, green).
Flour + molassestop 16% of all pairs

Smell alikemoderate

Cooked together10,429 recipes

Shared aroma: ethanol (alcoholic, ethereal).
Rye + molassestop 16% of all pairs

Smell alikelow

Cooked together804 recipes

Shared aroma: ethanol (alcoholic, ethereal).

Flour and milk barely smell alike, yet cooks put them together in 78,219 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

Rye meal: Gives the bread its dark, earthy flavour and a dense, moist crumb.
Baking soda: Reacts with the acidic sour milk and molasses to lift the batter as it steams.
Granulated cornmeal: Adds a coarse, crumbly texture and a sweet corn flavour.
Graham flour: Adds body and a nutty, wholesome texture to the loaf.
Molasses: Adds sweetness, dark colour and moisture.
Sour milk: Provides moisture and acidity that activates the baking soda for rising.

The step that matters

Keep the steaming water boiling and level with the mold. Steam is the only heat source, so the water must stay at a steady boil and reach about halfway up the mold. If it drops, the bread cooks unevenly and comes out dense and gummy.

“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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Boston Brown Bread