Boston Brown Bread Recipe America’s Test Kitchen: Molasses-Infused Steamed Loaf

There’s a timeless charm to a properly steamed loaf of Boston brown bread, with its dense, moist crumb and deep molasses flavor. This traditional New England recipe has been perfected through generations, and I’ve refined the technique to ensure consistent results every time.

The secret lies in the steaming process, which creates a tender, slightly sticky texture that pairs perfectly with the rich, slightly bitter notes of molasses. A blend of whole wheat and cornmeal adds hearty depth, while raisins or currants introduce a subtle sweetness.

Unlike oven-baked breads, this loaf stays moist for days, making it ideal for meal prep or gifting. The aroma alone—warm, earthy, and faintly spiced—signals that something special is coming out of the kitchen.

Once you taste this version, you’ll understand why it’s remained a beloved classic for over a century. The process is straightforward, but the results are anything but ordinary.

Ingredients for Boston Brown Bread Recipe America’s Test Kitchen

Whole grains, molasses, and warm spices create this New England classic with rich depth.

The cornmeal and whole wheat flour are non-negotiable here—Bob’s Red Mill or King Arthur brands are reliable. Molasses is the soul of this bread, so use unsulphured (like Brer Rabbit) for the cleanest flavor. Buttermilk adds tenderness; if you can’t find it, whole milk plus lemon juice works. Look for raisins that are plumper rather than shriveled—they’ll stay juicy in the steam.

No buttermilk? Stir 1 tbsp lemon juice into 1.25 cups whole milk and let sit 5 minutes. Swap raisins for currants or chopped dates if you prefer a different texture. The spices can be adjusted—more ginger for heat, less cinnamon for subtlety. Want it lighter? Replace half the molasses with maple syrup, but the flavor will be milder.

This loaf stays fresh for 4-5 days wrapped tightly at room temperature. For longer storage, freeze up to 3 months. Slice before freezing for easy toasting later. The flavor deepens overnight, so resist the urge to dig in immediately (worth the wait).

Step-by-Step Instructions for Boston Brown Bread

This traditional steamed loaf comes together with straightforward mixing and careful steaming for perfect texture.

Step 1: Combine Dry Ingredients for Even Distribution

In a large mixing bowl, whisk together the 1.5 cups Whole Wheat Flour, 0.75 cup Cornmeal, and 0.75 cup All-Purpose Flour until fully combined. This prevents any dense pockets of cornmeal in the finished loaf.

Add the 1 tsp Baking Soda, 0.5 tsp Salt, 0.5 tsp Ground Ginger, and 0.5 tsp Ground Cinnamon to the flour mixture. Whisk again thoroughly—the spices should be evenly dispersed so every bite carries their warm flavor.

Step 2: Mix Wet Ingredients Until Smooth

In a separate bowl, beat the 1 whole Large Egg lightly with a fork. Add the 0.75 cup Molasses and stir until the mixture is smooth and fully incorporated. The molasses is thick, so take your time here.

Pour in the 1.25 cups Buttermilk and the 2 tbsp Unsalted Butter (melted and cooled slightly). Stir until the wet ingredients form a uniform, glossy liquid. The buttermilk’s tang balances the molasses’ sweetness perfectly.

Step 3: Fold Everything Together with Raisins

Make a well in the center of the dry ingredients and pour in the wet mixture. Using a silicone spatula, fold the ingredients together just until the dry mixture is moistened. Overmixing will make the bread dense.

Gently stir in the 0.75 cup Raisins until evenly distributed throughout the batter. The batter will be thick but pourable, with visible flecks of raisins and a deep, rich color from the molasses.

Step 4: Steam the Loaf to Perfection

Pour the batter into a greased 9×5-inch loaf pan. Cover the top of the pan tightly with aluminum foil. Place the pan on a rack in a large pot with 1-2 inches of boiling water, ensuring the bottom of the pan doesn’t touch the water.

Cover the pot with a lid and steam for 1 hour and 15 minutes. Check the water level occasionally and add more boiling water if needed. The bread is done when a toothpick inserted in the center comes out clean.

Step 5: Cool Completely Before Slicing

Carefully remove the pan from the pot and let it cool on a wire rack for 10 minutes. Then, turn the loaf out onto the rack and remove the foil. Let it cool completely—this step is crucial for clean slices.

The finished loaf should have a moist, dense crumb with a rich molasses flavor and visible raisins throughout. Serve at room temperature for the best texture, with a pat of butter if desired.

Health Benefits of These Flavors

Rich in Fiber

This bread packs a serious fiber punch thanks to the whole wheat flour and cornmeal. A single slice provides about 4-5 grams of fiber, which supports digestive health and keeps you feeling full longer. I find it’s a great way to start my day with sustained energy. 💪

Iron Boost

The molasses in this recipe is a natural powerhouse for iron—just 1 tablespoon contains about 3.5mg, and this loaf uses ¾ cup. That’s roughly 20% of your daily iron needs per serving, making it especially beneficial for anyone needing an iron-rich diet.

Natural Energy Source

Molasses also provides calcium, magnesium, and potassium, which work together to support muscle function and energy levels. The slow-digesting carbs from the whole grains help maintain steady blood sugar, avoiding those mid-morning crashes.

Antioxidant Benefits

The raisins add more than just sweetness—they’re loaded with antioxidants that combat oxidative stress. Combined with the ginger and cinnamon, this bread offers a delicious way to incorporate immune-boosting compounds into your diet.

Low-Fat Option

With only 2 tbsp of butter in the entire loaf, this is a naturally low-fat bread that doesn’t sacrifice flavor. The buttermilk adds richness without excess fat, making it a heart-healthy choice for those watching their intake.

Long-Lasting Energy

The complex carbohydrates from whole grains and molasses provide a slow, steady release of energy. I love having a slice with my afternoon tea—it keeps me going without the jitters of sugary snacks. 💛

Frequently Asked Questions