Why It Works
- Low-protein all-purpose flour allows for plenty of buttermilk without excessive gluten formation, so the bread is chewy but tender—never tough.
- An extra 1/8 teaspoon baking soda is the most reliable way to mimic the casual, rounded teaspoon measurements more common in days of yore, ensuring that the buttermilk's acidity is fully spent, for a fluffy loaf with a subtle pretzel-like flavor.
- Sifting improves distribution of the soda while aerating the flour, making it easier to incorporate the buttermilk without any lumps.
- Buttermilk has the perfect viscosity and pH for this recipe, so steer clear of DIY alternatives (and trust me, I've tried them all).
Given our obsession with quick and easy no-knead recipes, I'm always bummed to see Irish soda bread relegated to the realm of St. Patrick's Day novelties. Not only because it's far more authentic than green beer or some random cake soaked in Baileys, but because old-school recipes turn out a legitimately fantastic loaf in no time at all.
Old-school, because I'm not talking about wheels of crumbly "bread" that taste like a diet scone (more on that in a sec), nor an overgrown muffin chock-full of butter, sugar, eggs, and fruit. I mean, generally speaking, I'm all about sugar muffins loaded with butter and fruit, but such recipes are to Irish soda bread what Diet Coke is to lemonade—a complete and total non sequitur.
So-called "aerated" breads emerged in the 1820s, as commercial bakers in London discovered that the volatile reaction between baking soda (sodium bicarbonate) and hydrochloric acid could free their schedules from the plodding tyranny of yeast. The idea was to create a loaf to rival the finest yeasted bread, which led to a slew of patents filed by bakers hoping to corner the market.
Mercifully, folks at home paired baking soda with a far tastier and less alarming alternative: buttermilk. That same combo gave rise to cornbread in America, but, with "patent bread" as their model, British bakers favored plain white flour (even then vastly more popular than whole wheat). Soda bread's association with Ireland arose after the devastation of the country's potato crop in the 1840s, which forced a people historically ambivalent toward bread to start baking en masse.
Dire origins meant no splurge-y ingredients or complicated technique; just loads of buttermilk, enough flour to form a soft dough, and plenty of baking soda to ensure a good rise. The dough went into a cast-iron pot, tucked into a bed of live coals, and left to bake through and through—a daily ritual that kept folks fed.
Old-School vs. Modern Soda Bread
Forgetting the heretical subset of modern recipes that envision soda bread as a strangely modest cupcake, more traditional versions stick to the basics: roughly 14 ounces of buttermilk, plus a level spoonful of soda and salt for every pound of flour. It makes a dough that's soft but easy to knead, and stiff enough to retain its shape on a baking sheet. Modern soda bread bakes up rather crumbly and pale, no crustier than an overbaked scone and bland but for the tang of buttermilk. Peasant food, amirite?
It's an earnest re-creation of a bread that earned its place at a time when recipes never got any more specific than a "big spoonful" of soda and "as much buttermilk" as needed to form a dough, but I'm not convinced that soda bread was ever meant to be a giant scone. Not simply because that's not my particular cup of (Irish) tea, but because it doesn't seem to jibe with the facts.
The Earliest Recipes
The oldest recipe for soda bread, widely syndicated from Ireland's Newry Times in 1836, says the dough was "as soft as could possibly be handled...the softer the better." Thirteen years and 180 miles down the road, the Waterford Times described it as "wetter than pie crust, too stiff to pour, but not stiff enough to roll."
It's like soda bread ambled right up to the line between a batter and a dough and just shrugged—too stiff to slouch over the edge, but sloppy enough you thought it might. I don't reckon that's the kind of dough anyone would try to knead, something few recipes even mention; most jump straight from mixing to panning, emphasizing the importance of haste.
In the midst of famine, soda bread stretched something expensive (white flour) with something cheap (local buttermilk), and replaced something slow (yeast) with something wonderfully fast (soda).
No Need to Knead
To an extent, glossing over a step like kneading can be chalked up to the general lack of direction in old-timey recipes, but, as a rule of thumb, aerated breads were too soft to knead. Given the context of soda bread's popularity in Ireland, I'm inclined to take that language at face value. In the midst of famine, soda bread stretched something expensive (white flour) with something cheap (local buttermilk), and replaced something slow (yeast) with something wonderfully fast (soda). So why would anyone waste time and flour kneading a dough when they could just scrape it into a skillet and be done?
Sweet or Sour? The Role of Baking Soda
Especially considering that baking soda, unlike yeast, won't continue to produce carbon dioxide over time. The clock starts ticking as soon as the buttermilk is added, which brings us to another curious point of fact: Modern soda bread is generally a little sour. Okay, sure, that seems perfectly natural considering all the tangy buttermilk, but 19th-century soda bread was widely praised for its sweetness. You and I hear that term and think sugar, but in those days, it simply distinguished soda bread from the funky flavor of traditional sourdoughs (a.k.a. everything prior to the advent of granulated yeast).
For buttermilk to taste sweet (i.e. not sour) its acidity would need to be fully neutralized by the baking soda. That tells us that its primary purpose was to leaven the dough, making soda bread particularly light, fluffy, and oh-so-slightly alkaline.
Now, taken to its soapy extreme, that can be a Terrible, Horrible, No Good, Very Bad Thing. But! As I learned while perfecting my gingersnaps, a little alkalinity can taste truly magical. Think Dutch cocoa, corn tortillas, and ramen noodles—remember that baking soda hack to turn dry spaghetti into ramen noodles?
A slightly elevated pH can enhance texture, moisture retention, and flavor. I believe that such a Triforce of power (chewiness, moisture, and flavor) would have freed soda bread from the trials and tribulations that plague it today, namely, all things crumbly, dry, and bland.
Lessons From the 19th Century Version
Putting my theory to the test, I abandoned modern expectations of how soda bread should be made and followed a set of 19th-century instructions to the T, or, at least, as close to that T as a baker's intuition could allow given the subjective directions.
Instead of measuring a level teaspoon of soda, I scooped it with the casual disregard of a 19th-century baker who knew exactly what she was doing. I also kept the buttermilk flowin', bypassing the texture of pie or biscuit dough, until I had something too soft to handle, too stiff to pour.
I scraped the whole thing into a cast-iron Dutch oven lined with parchment to prevent the lean and sticky dough from, well, sticking (a far less likely problem when cooking over an open flame). Authenticity may have demanded a turf fire in my backyard, but I settled for preheating the oven to 450°F (230°C)—even I have limits.
After an hour, I pulled out an absolutely gorgeous boule, golden-brown, with an audibly crackling crust. From that moment on, I was helplessly in love. This was the sort of bread that could save a nation, providing not just a mass of calories but morale.
Before digging in, I let the soda bread cool on a wire rack for about 15 minutes, a completely arbitrary time determined strictly by my own impatience. The sound of it was glorious, accompanied by a shower of crispy shards that flew out with every pass of the blade until my knife sank into a pillow crumb that gave way as cleanly as any sandwich loaf.
My first slice was without butter or salt, yet it tasted moist and rich, with an aroma something like that of a bakery-style pretzel—mild, but distinct. My second, third, fourth, and fifth slices were consumed in a blur of butter and honey, halted only by my husband's arrival in the kitchen and the Judgey McJudgerson look on his face (the tables were shortly turned, and the bread demolished).
We feasted for a month, as subsequent experiments taught me the ins and outs of soda bread. While ingredients certainly matter (buttermilk more so than flour, to be honest), the real trick is in how the dough is handled.
Handling the Dough
Because of its incredible hydration (120%, or 20% more buttermilk than flour by weight), how you stir the dough has a huge impact on gluten formation. Keep things to a bare minimum, and the soda bread will bake up with a craggy, crunchy crust. With a few extra folds, the crust turns smooth, thin, and delicate but crisp, while the interior gains enough structure to rise up a little higher.
Without any special effort, soda bread will fall somewhere in between, creating a delicious average. But with a mindful approach, you can encourage the dough in either direction: less stirring for a more rustic loaf, more stirring for a smoother, better-risen one.
Serious under-mixing can produce a slightly gummy loaf, but that won't happen so long as there are no obvious streaks of buttermilk in the raw dough. Similarly, it's difficult to over-mix unless you go to comical extremes; while a full minute on the stand mixer did deflate things a bit, my soda bread was still delightfully chewy rather than tough.
Ultimately, whichever way it's handled, what I love most about this buttermilk-heavy style is that it turns soda bread into a proper bread. Not like Banana "We All Know I'm a Cake" Bread, or crumbly Corn "Don't Call Me a Muffin" Bread, but a legitimate hearth bread, sturdy enough to mop up a bowl of beef stew, mild enough to pair with salty cheese or charcuterie, and tasty enough to justify a binge.
It may not be what we've come to expect on St. Patrick's Day, but if loving 19th-century soda bread is wrong, I don't wanna be right.
How to Make Real Irish Soda Bread
15 ounces all-purpose flour, such as Gold Medal (3 cups; 425g)
1 3/4 teaspoons (7g) Diamond Crystal kosher salt; for table salt, use the same weight or half as much by volume
1 1/8 teaspoons (6g) baking soda (see note)
18 ounces low-fat cultured buttermilk (2 1/4 cups; 510g), well shaken
Adjust oven rack to middle position and preheat to 450°F (230°C) at least 15 minutes in advance. Roughly cover bottom of deep 10-inch cast-iron or enameled Dutch oven with sheet of parchment paper; no need to trim.
Combine flour, salt, and baking soda in a large bowl and whisk for full minute to combine. Stir in buttermilk with flexible spatula until dough is fully moistened and no pockets of flour remain. For extra-fluffy results, stop folding as soon as dough comes together. For extra-chewy results, fold dough about 20 seconds more. Scrape sticky dough into prepared Dutch oven and smooth with spatula into rough boule-like shape. Score deeply into quarters with sharp knife or razor, cleaning the blade between each slice.
Cover and bake until well risen and golden, 45 minutes. Remove lid and continue baking until chestnut brown, with an internal temperature of 210°F (99°C), 12 to 15 minutes longer. Invert onto a wire rack, discard parchment, turn right side up, and cool until crumb has set, about 30 minutes. Cut thick slices to accompany hearty soups and stews, or slice thinly for sandwiches. (This will be easier if bread cools at least 2 hours.) Store up to 24 hours in an airtight container and toast to freshen bread before serving.
Unless your digital scale is exquisitely sensitive, measure the baking soda by volume; even an extra gram can produce an unpleasantly soapy loaf of bread.
|Nutrition Facts (per serving)|
|Servings: 10 to 12|
|Amount per serving|
|% Daily Value*|
|Total Fat 1g||1%|
|Saturated Fat 0g||1%|
|Total Carbohydrate 29g||11%|
|Dietary Fiber 1g||3%|
|Total Sugars 2g|
|Vitamin C 0mg||2%|
|*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.|