Why it works: Flour and buttermilk are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 3,721 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
Irish Soda Bread
Serves 8Ingredients
Directions
Prepare
Preheat oven to 325°F (160°C).
Grease and flour a 9x5-inch loaf pan.
Combine flour, baking powder, baking soda, sugar, and salt in a large mixing bowl.
Mix and bake
Blend egg and buttermilk together, and add all at once to the flour mixture.
Mix until just moistened; too much mixing will make it tough.
Stir in butter; pour into prepared pan.
Bake for 65–70 minutes, or until a toothpick inserted in the bread comes out clean.
The loaf should sound hollow if you tap the base.
Cool and rest
Cool on a wire rack.
Wrap in tea‑towel or foil several hours or overnight for best flavor.
Nutrition, whole recipe (rough)
What these numbers assume: 6 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Flour | 1 cup (125g) all-purpose | 455 |
| Milk | 1 cup (244ml) whole | 149 |
| Butter | 1 tbsp (14g) | 102 |
| Egg | 1 large egg (50g) | 78 |
| Sugar | 1 tbsp (12.5g) granulated | 49 |
| Salt | 1 tsp (6g) | 0 |
One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.
Steps grouped into stages for easier reading; the method is the source's own.
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.
-
Flour + buttermilktop 8% of all pairsSmell alikemoderateCooked together3,721 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Sugar + buttermilktop 9% of all pairsSmell alikestrongCooked together2,973 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
-
Flour + eggtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
Flour and butter barely smell alike, yet cooks put them together in 124,287 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
- All-purpose flour
- Forms the structure of the loaf as its proteins develop with liquid.
- Baking powder
- Releases gas in the batter so the loaf rises without yeast.
- Baking soda
- Reacts with the buttermilk's acidity to produce gas and lift the loaf.
- Buttermilk
- Adds moisture and acidity that activates the baking soda and tenderizes the crumb.
- Egg
- Binds the batter and adds richness and structure to the crumb.
- Butter
- Adds fat for tenderness and flavor in the finished loaf.
The step that matters
Mix until just moistened. Stirring too much develops gluten in the flour, which makes the bread tough and dense. Lumps left in the batter are fine and keep the crumb tender.
“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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