What gluten actually does
Wheat flour earns its place in baking through gluten, the protein network that forms when flour meets water and heat. Gluten gives a cake its structural backbone — it traps the gas from raising agents, holds the crumb together as it sets, and creates that slightly springy texture. Take it away and the batter has nothing to grip. Without that network, cakes can collapse, turn dense or fall apart on the plate.
There is a moisture problem too. Gluten-free batters often bake out drier and more crumbly than their wheat equivalents, because starch-based flours do not hold onto water the same way. Solving both issues at once — structure and moisture — is what makes formulating a gluten-free cake genuinely tricky.
Why almonds are such a good answer
Ground almonds bring three things to a cake: fat, protein and moisture retention. The fat keeps the crumb tender and stops it drying out; the protein provides some of the structural binding that gluten would otherwise supply; and the fine, slightly oily texture of ground almonds traps liquid in a way that rice flour or potato starch cannot. The result is a cake that slices cleanly, holds together on the fork and stays that way for days rather than hours.
This is why some of the most celebrated almond-based cakes in European baking were always wheat-free, long before anyone used that phrase on a label. The Tarta de Santiago, the Galician almond cake decorated with the cross of Saint James, is made entirely without flour. So are traditional friands — small cakes eaten across Australia and Britain — and many versions of the dense, fragrant clementine cakes associated with British baking. Polenta cakes, too, often pair ground almonds with coarse-ground corn to compensate for polenta's lack of binding power. These are not workarounds; they are simply recipes built around almonds from the start, which happen to contain no gluten.
What goes into a blended gluten-free flour
Not every gluten-free cake leans on almonds. Commercial gluten-free flour blends combine several starches and flours to approximate the behaviour of wheat. Rice flour is the most common base — neutral in flavour and fine in texture. Buckwheat flour (which, despite the name, is entirely unrelated to wheat and contains no gluten) adds a slightly earthy depth. Potato starch and tapioca starch act as binders and help recreate some of the elasticity that gluten provides.
No single alternative flour does everything wheat flour does, so the blends divide the work: one ingredient for texture, another for binding, another for lightness. Some mixes also include xanthan gum, a natural thickener that mimics gluten's ability to trap gas. Even a well-made flour blend typically produces a slightly denser crumb than wheat, though results have improved considerably as bakers have refined their ratios.
Almond cakes age better
Ground almond cakes also behave differently after baking. Where a standard sponge stales quickly, an almond cake holds its moisture for considerably longer. The fat in the almonds keeps working after the cake leaves the oven, and many bakers find that a clementine or almond polenta cake actually improves on the second day, the flavours settling and deepening as it rests.
For independent bakers selling at markets or through postal delivery, this matters practically. A cake that travels well and lasts several days gives both maker and buyer more flexibility than a short-lived sponge.
Labelling and cross-contamination
'Gluten-free' on a label has a legal meaning — there is a regulated threshold that products must meet to carry the claim. For anyone with coeliac disease or gluten sensitivity, the production environment matters as much as the ingredients: a cake made with no gluten-containing ingredients can still be a concern if baked or packed alongside wheat products. Coeliac UK is the most reliable source of guidance on cross-contamination risk and labelling standards — their website is worth bookmarking if this affects you or someone you cook for.
