Why Gluten-Free Bread Behaves Differently

If you have ever pulled a gluten-free loaf from the oven only to watch it collapse, or sliced into a crumb that shatters like shortbread, you are in good company. Without gluten, there is no elastic network to trap the gas your yeast produces, so bubbles rise and escape, and whatever structure remains is held together by starches alone. Those starches set firm as they cool, which is why so many gluten-free loaves are sandy on day one and rock-hard by day three. None of this is a mystery, though. Once you understand what you are replacing, you can build a loaf with real structure, a soft crumb and — crucially — slices that hold together in the toaster.

Building a Balanced Flour Blend

Single flours rarely work. A blend of wholegrain flours for flavour and starches for lightness gives a far better crumb. A reliable starting point is roughly 40 per cent wholegrain to 60 per cent starch by weight.

• Brown rice flour — mild, slightly nutty, and a dependable base.
• Sorghum or millet — adds a wheat-like flavour and a little structure.
• Buckwheat — earthy and distinctive; keep it to 10–15 per cent of the blend.
• Tapioca starch — gives chew and helps the crumb stay springy.
• Potato starch — lightens the loaf and keeps it tender.
• Cornflour — softens the crumb and reduces grittiness.

Weigh everything in grams. A cup of one flour is not the same as a cup of another, and small variations make a big difference when there is no gluten to forgive them.

Psyllium Husk: The Quiet Hero

If there is one ingredient that transforms gluten-free bread, it is psyllium husk. It is a soluble fibre that absorbs many times its weight in water and forms a gel, and that gel does the work gluten would otherwise do: it traps gas, holds moisture and gives the dough enough stretch to rise rather than slump. You will find it as whole husk or as a fine powder. Whole husk gives a slightly more open crumb; powder blends in invisibly but can turn the dough gluey if you overdo it.

Use around 10–15g of psyllium per 500g of flour — roughly two teaspoons of whole husk — and always hydrate it separately. Whisk it into the water first and let it thicken for a minute or two before adding the flours. Skip this step and you will end up with stringy pockets and a damp, gummy centre.

Hydration: Where Most Loaves Are Won or Lost

Gluten-free doughs need far more water than wheat doughs, often 85–100 per cent hydration against the flour weight. It looks wrong — more like a thick batter than a dough — and that is entirely normal. That water is what hydrates the starches and the psyllium, and without it the crumb will be dry and crumbly regardless of what else you do.

Use warm water, around 38–40°C, to wake the yeast without killing it. Add it gradually and judge by feel: the mixture should ribbon off a spatula and hold a soft shape on the surface for a moment. If it pours like double cream, add a spoonful of starch. If it stands stiffly, loosen it with a splash more water. Let the batter rest for 20–30 minutes before baking — a short autolyse that lets the flours absorb the liquid and takes away much of the grittiness.

Proving and Baking for a Proper Crust

Forget the two-rise routine from wheat baking. Gluten-free dough has little strength to spare, so mix it, scoop it into a lined 2lb loaf tin, smooth the top with a wet spatula, and prove it once. Cover it and leave it somewhere warm for 30–45 minutes. You are not looking for a doubling — a modest lift and a few small bubbles at the surface are plenty. Over-proving is the fastest route to a sunken top.

Bake in a preheated oven at 210°C (fan 190°C) for the first 15 minutes, then drop to 190°C (fan 170°C) for a further 35–45 minutes. A loaf this wet needs a long bake, and a digital thermometer is the surest test: you want 96–99°C in the centre. If the crust browns too quickly, tent it with foil. For a softer crust, brush the top with a little melted butter as it comes out.

Cooling, Slicing and Keeping

This is the step everyone rushes and everyone regrets. Gluten-free bread is still setting as it cools. Leave it in the tin for ten minutes, then turn it out onto a rack and wait at least two hours — ideally until completely cold — before cutting. Slice it warm and you will crush the crumb and release steam that turns the middle to paste.

Once cool, slice the whole loaf and freeze what you will not eat within a day or two. Slices defrost in minutes and toast beautifully from frozen. A brief warm-through in the oven restores a fresh-baked crust, and a loaf kept this way will serve you far better than one left on the worktop to stale.