A Gluten-Free Sourdough Loaf That Is Actually Bread

Wild fermentation does something for gluten-free bread that yeast cannot: flavour, a softer crumb, and a loaf that keeps. It takes five days to start and about twenty minutes of work a day after that.

Outspoken Digest Food Desk

Tuesday, August 11, 2026/3 min read

A dark round sourdough loaf cut open on a board to show an even crumb — Editorial illustration generated for Outspoken Digest

Gluten-free bread has an honesty problem. Most of it is a starch cake with yeast in it: pale, sweetish, dry by the afternoon and stale by the next morning.

Sourdough fixes more of that than people expect. The long fermentation develops acids that make the crumb softer and slow staling, breaks down some of the starch that otherwise tastes flat, and gives the loaf actual flavour rather than the faint sweetness that plagues commercial gluten-free bread.

What it cannot do is give you gluten. The structure still has to come from psyllium. Fermentation supplies the taste and the keeping quality.

The starter, five days

Use brown rice flour or buckwheat flour. Buckwheat ferments faster and more reliably, which is why it is the better choice for a first attempt.

Day 1. Mix 50 g buckwheat flour with 50 g water in a jar. Cover loosely.
Days 2 to 5. Each day discard half and feed with 50 g flour and 50 g water.

By day four or five it should smell sour and fruity rather than sharp, and roughly double within six hours of feeding. In a warm kitchen this happens faster. In an air-conditioned one it takes longer, so find a warmer corner.

Gluten-free starters are wetter and less dramatic than wheat ones. Do not expect the same rise. Bubbles throughout and a clean sour smell are the signal.

Ingredients for the loaf

100 g active starter
25 g whole psyllium husk
420 ml warm water
150 g buckwheat flour
150 g brown rice flour
100 g tapioca starch
50 g sorghum or millet flour
10 g salt
1 tablespoon honey or maple syrup
2 tablespoons olive oil

Method

1. Gel the psyllium

Whisk the psyllium into the warm water and leave five minutes, until it thickens into a loose jelly. Add the starter, the honey and the oil, and whisk again.

Never add psyllium dry to the flours. It clumps and the lumps never hydrate, which produces a loaf with slippery pockets in it.

2. Mix

Combine the flours and salt in a bowl, add the psyllium mixture, and mix with a spatula until no dry flour remains. It will be a thick, sticky paste rather than a dough. That is correct.

Do not knead. There is no gluten to develop and working it does nothing but warm it up.

3. Bulk ferment

Cover and leave at room temperature for four to six hours. It should puff visibly, perhaps by half again, and show bubbles at the edges of the bowl.

This is slower than wheat sourdough and less visually rewarding. Judge it by time and bubbles, not by doubling.

4. Shape and prove cold

Scrape onto a wet surface, shape into a round with wet hands, and place seam side up in a banneton lined with a floured cloth. Refrigerate overnight, eight to twelve hours.

The cold prove is what makes the loaf sliceable. Skip it and you get a gummy interior.

5. Bake in a covered pot

Heat the oven to 230C with a Dutch oven inside for at least 30 minutes. Turn the loaf onto baking paper, score it once, deeply, and lower it in.

Bake covered for 40 minutes, then uncovered for 20 to 25 minutes until dark. Gluten-free loaves need a longer bake than wheat and are usually underbaked, which is where the gumminess comes from. The internal temperature should be above 96C.

6. Wait

Cool completely before cutting. At least four hours, ideally overnight. This is the hardest instruction in the recipe and the least optional, because the crumb is still setting as it cools and cutting it hot gives you paste.

Notes

It keeps three to four days cut side down on a board, and slices freeze well. Toasting improves it from day two onward.

The starter lives in the fridge and needs feeding once a week. If you have been keeping a wheat starter, you cannot convert it, because the flour it was raised on stays in the mix. Start a new one.

Every flour blend absorbs differently, so treat the water quantity as a starting point. The paste should be thick but pourable, not stiff. Our guide to what each gluten-free flour does explains why substituting one for another changes the hydration.

Cross-contamination

If you have coeliac disease, use certified flours, and be aware that a kitchen that also bakes with wheat carries real risk from airborne flour, shared boards and the toaster. The reasoning is in our piece on coeliac disease versus gluten sensitivity, and it is why the answer to how careful you need to be depends on which one you have.

Published in The Outspoken Digest

Editorial desk

Outspoken Digest Food Desk

Cooking, ingredients, restaurants and the economics of what ends up on the table.

gluten free sourdough buckwheat bread recipe psyllium bread gluten free baking coeliac bread

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