Maris Piper Potato

The potato's success in commercial frying comes down to science. When submerged in hot oil, moisture inside the cell walls turns to steam, puffing the starch granules and creating the characteristic fluffy interior. Simultaneously, the exterior surface dries and caramelises into a crisp shell. Maris Piper's starch structure and moisture content cooperate perfectly in this process—too much moisture and the exterior steams rather than fries; too little starch and the interior stays dense. This is why substituting a waxy variety like Charlotte produces sad, chewy chips that collapse within minutes. The variety has been partially superseded in large-scale commercial growing by newer high-yielding cultivars, but it remains the benchmark in chip shops where quality matters.

The two-stage cooking method transforms Maris Piper into something exceptional. Parboiling for approximately 10 minutes cooks the exterior enough to allow the skin to set, but leaves the centre firm and wet. Shaking the drained potatoes in the pot jostles the surfaces, creating microscopic rough patches. These rough edges are the secret: they dramatically increase the surface area in contact with the fat, producing more crunch and more crust. The agitation also roughens the starchy surface, which crisps more aggressively than a smooth surface would. This technique works specifically because Maris Piper is floury enough to fluff at the edges without disintegrating—a waxy potato would break up under this treatment.