Name: Boston Brown Bread
Ingredients: 2 cups Indian meal; 1 cup rye flour; 1 cup all-purpose flour; 1 scant pint sweet milk; 1¾ cups molasses; Pinch of salt; 1 teaspoon baking soda; 1 teaspoon hot water; 2 teaspoons cream of tartar or 2 heaping teaspoons baking powder

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

Oven, in the book's wordsA moderate oven

Ingredients

Directions

Make the batter

Combine Indian meal, rye flour, all-purpose flour, sweet milk, molasses, and salt in a bowl.
Dissolve baking soda in hot water and add to the mixture.
Stir in cream of tartar or baking powder.

Steam

Pour the batter into a covered tin.
Steam for 4 hours, ensuring the water is boiling throughout.

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

Indian meal: Provides the coarse, dense body and characteristic grainy texture of the bread.
Rye flour: Adds earthy flavor and a denser crumb through its lower gluten content.
All-purpose flour: Supplies gluten for structure so the steamed loaf holds together.
Molasses: Adds sweetness, dark color and moisture, and deepens the flavor.
Baking soda: Reacts with the acid in the batter to produce gas that lightens the loaf.
Cream of tartar or baking powder: Supplies acid or leavening that works with the baking soda to help the bread rise.

The step that matters

Steam for 4 hours, ensuring the water is boiling throughout. Steam is the only heat source here, so the water must stay boiling for the full time. If it drops, the loaf cooks unevenly and may turn 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