Flatbreads
Making Soda Bread with Wholemeal and Buttermilk
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James Whitcombe
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11 September 2026
6 mins read
Why Soda Bread Earns Its Place in a Busy Kitchen
Soda bread is the loaf I reach for when the day has run away with me and there is still supper to put on the table. There is no yeast, no proving, no waiting for dough to double. Bicarbonate of soda reacts with the acid in buttermilk the moment they meet, so the rise happens in the oven rather than on the worktop. From weighing out to pulling a warm, craggy loaf from the oven takes well under an hour, and most of that is baking time you can spend doing something else.
The Irish knew what they were doing. Wholemeal flour gives the loaf a nutty, slightly sweet depth, while buttermilk brings tang and tenderness. The result is dense but not heavy, sturdy enough for thick butter and sharp marmalade, and honest enough to serve alongside soup without apology. If you have only ever bought soda bread in a plastic sleeve, this will be a revelation.
The Short List of Ingredients That Actually Matter
You need four things, plus a little liquid slack. Here is the ratio I use for one round loaf:
- 400g wholemeal flour — coarse or medium stoneground is best; fine wholemeal works but gives a closer crumb
- 100g plain white flour — this lightens the loaf and helps it hold together
- 1 tsp bicarbonate of soda — level, and fresh; check the date on the tin
- 1 tsp fine sea salt
- 400–450ml buttermilk — plus a splash of milk if the dough needs it
That is it. No butter, no sugar, no yeast. If you have no buttermilk, stir 1 tbsp lemon juice or cider vinegar into 450ml whole milk and leave it for ten minutes until it looks slightly thickened and curdled. It will not be identical, but it will activate the soda and give you a decent loaf.
Mixing Fast and Lightly
Preheat the oven to 200°C (180°C fan, gas mark 6) and dust a baking tray with a little wholemeal flour. In a large bowl, whisk the two flours, bicarbonate of soda and salt together so the soda is evenly distributed — any pockets of it will taste soapy and leave grey streaks in the crumb.
Pour in most of the buttermilk and bring everything together with a table knife or your hand, using a light, folding motion. The dough should be soft and slightly sticky, but not wet enough to run. Add the last of the buttermilk a tablespoon at a time if it feels dry; wholemeal flours vary in how much they drink. Work quickly. The moment the buttermilk hits the soda, the clock is ticking, and over-handling makes a tough loaf. You are aiming for a shaggy ball in under a minute, not a smooth, kneaded dough.
Shaping, Scoring and the Meaning of the Cross
Turn the dough onto a floured surface and shape it lightly into a round about 18cm across. Do not knead it. Pat and cup it with your hands, tucking the edges underneath to give a little height, then transfer it to the tray.
Cut a deep cross into the top with a floured knife, going about two-thirds of the way down through the dough. The old story is that the cross lets the fairies out; the practical truth is that it lets steam escape and helps the loaf open evenly rather than splitting at the side. Prick each quarter once with the tip of the knife, which the Irish call letting the devil out — again, it is really about controlled expansion.
Baking, Tapping and the Patience of Cooling
Bake for 30–35 minutes. The loaf is ready when it has risen, browned to a deep chestnut, and sounds hollow when you tap the base with your knuckles. If you want certainty, a skewer pushed into the centre should come out clean. If the top is colouring too fast, lay a sheet of greaseproof paper over it for the last ten minutes.
Now the hard part. Lift the loaf onto a wire rack and drape a clean tea towel over it while it cools. This softens the crust slightly and keeps the crumb moist. Cutting while hot gives you a gummy slice, so give it at least twenty minutes — half an hour is better. Soda bread is at its finest on the day it is baked, though it toasts beautifully on the second day and makes excellent crumbs for a savoury gratin.
Small Tweaks and Common Pitfalls
If your loaf is flat and dense, the soda is probably old or the dough was too wet. If it tastes bitter, you used too much bicarbonate. If it crumbles as you cut it, you were too generous with the wholemeal and short on the white flour.
Once you are confident, try these variations:
- Seeded: add 50g mixed sunflower, pumpkin and linseed to the dry ingredients
- Oat and honey: swap 50g of the wholemeal for porridge oats and add 1 tbsp honey to the buttermilk
- Savoury: fold in 75g grated mature Cheddar and a handful of chopped chives
Wholegrain baking rewards a light hand and a hot oven rather than precision and patience. Make it once and you will wonder why you ever waited for yeast.
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