Cast Iron Care Myths UK Cooks Still Believe (And Why They Are Holding You Back)

Picture this: it is a grey Sunday morning in November, somewhere in the Peak District. A pot of Staffordshire oatcakes is warming on the hob, and on the back burner sits a cast iron skillet that has not been washed properly since the Blair government. The owner swears by it. It has never touched soap. It has never gone near the dishwasher. And yet, despite this apparent devotion, the eggs still stick, the seasoning looks patchy and uneven, and a faint smell of rancidity hangs in the air every time the heat goes up.

This scene plays out in kitchens across Britain every single week. From a terraced house in Bradford to a farmhouse kitchen in rural Herefordshire, cast iron cookware is cherished — and simultaneously misunderstood — by a remarkable number of UK cooks. Some of these myths have been passed down through generations. Others have sprung up from the internet, mutating across Facebook groups and Reddit threads until they bear almost no resemblance to the original truth.

Cast iron is genuinely extraordinary cookware. Whether you own a vintage Griswold picked up at a car boot sale in Norfolk, a gleaming new Lodge skillet ordered online, or a heavyweight Le Creuset Dutch oven inherited from a relative who cooked in it for forty years, the principles of care are the same. And most of what people believe about that care is wrong.

Let us go through the myths properly. Not with vague reassurances, but with real explanations and practical guidance that will actually improve your cooking.

Myth One: You Must Never Use Soap on Cast Iron

This is the big one. The myth so entrenched that people will argue about it in the comments section of a BBC Food recipe with the same fervour they reserve for whether Yorkshire pudding belongs on a roast or not.

The belief goes like this: soap will strip the seasoning from your cast iron pan and ruin it. Therefore, soap must never touch cast iron. Full stop. End of discussion.

Here is the actual truth. Modern washing-up liquid — the kind you buy at Tesco, Waitrose, or the local corner shop — is formulated with gentle surfactants designed to cut through grease without damaging surfaces. The old fear about soap came from an era when cleaning products contained lye, also known as sodium hydroxide, which is genuinely caustic and will degrade polymerised oil seasoning over time. Those products were common well into the twentieth century in Britain. They are not what you are using today.

A small amount of standard washing-up liquid, applied with a sponge or brush, rinsed immediately, and dried thoroughly, will not strip a well-built seasoning. It simply will not. The seasoning on cast iron is a layer of polymerised oil — oil that has been heated past its smoke point until it has chemically bonded to the iron surface. That bond is not broken by a few seconds of Fairy Liquid. It is broken by prolonged soaking, by abrasive scrubbing pads, and by leaving the pan wet.

The dangerous consequence of this myth is that people avoid cleaning their pans properly, which leads to rancid fat building up in layers, bacterial residue sitting in the pores of the iron, and ultimately a pan that smells and performs poorly. If you have been cooking fish in a pan that has never been cleaned with soap, your scrambled eggs the next morning will tell the tale.

The rule is simple: clean the pan properly, use a little soap if needed, rinse it, dry it completely on the hob over low heat, and apply a very thin layer of oil before storing. That is it. The pan will be fine.

Myth Two: Le Creuset and Regular Cast Iron Are Cared for in the Same Way

Le Creuset is a French brand with a strong foothold in the UK market. Walk into any John Lewis, Lakeland, or Sous Chef and you will find their enamel-coated cast iron in a range of colours — volcanic orange, cerise, marseille blue — stacked neatly on shelves at prices that make you want to sit down for a moment.

Many UK cooks treat enamel cast iron and bare cast iron as though they are the same product requiring the same care. They are not.

Bare cast iron — Lodge skillets, vintage British pieces, unbranded market finds — requires seasoning. The raw iron surface needs a coating of polymerised oil to be non-stick and to resist rust. All the seasoning rules apply: no prolonged soaking, dry thoroughly, oil lightly after washing.

Enamelled cast iron, like Le Creuset, has a vitreous enamel coating fused to the iron at very high temperatures during manufacture. This coating does not need seasoning. It does not rust. It is non-reactive, which means you can cook acidic foods like tomatoes, wine-based sauces, and rhubarb without any issue whatsoever. You can use proper washing-up liquid freely. You can even put most Le Creuset pieces in the dishwasher, though the company itself recommends hand washing to preserve the appearance over decades.

What you should not do with Le Creuset is use metal scourers, expose it to sudden extreme temperature changes (known as thermal shock), or heat it empty at very high temperatures on the hob for extended periods. The enamel can craze or chip under these conditions. A chipped enamel interior is not a food safety crisis — the NHS and Food Standards Agency have no specific guidance against using slightly chipped enamel cookware — but it can harbour bacteria if the chips create deep crevices, and it is generally a sign that the pan needs retiring or replacing.

The confusion between these two types of cast iron leads to problems in both directions. People unnecessarily season their Le Creuset and end up with sticky, brownish build-up. And people soak their bare cast iron in water for hours because they think it is as robust as enamel. Neither outcome is good.

Myth Three: Cast Iron Heats Evenly, Which Is Why Chefs Love It

This myth is told so often and so confidently that it appears in newspaper food columns, lifestyle magazines, and even some cookery books sold in Waterstones. The idea is that cast iron distributes heat beautifully and evenly, which is why it produces such consistent results.

Cast iron is, in fact, a notoriously poor conductor of heat. Compared to copper or aluminium, it spreads heat slowly and unevenly. Put a cast iron skillet on a gas hob in a typical British kitchen and the part directly over the flame will be significantly hotter than the edges. You will get a hot spot in the middle and cooler zones around the perimeter.

What cast iron is genuinely excellent at is heat retention. Once it has reached temperature — and this takes longer than most people expect — it holds that heat with impressive stubbornness. This is exactly why it is so good for searing a steak or achieving a proper crust on a loaf of bread. When you place a cold piece of meat in a cast iron pan, the temperature does not drop dramatically the way it would in a thin aluminium pan. The pan holds its heat and keeps the cooking process steady.

The practical lesson for UK cooks is this: preheat your cast iron for longer than you think necessary, and preheat it gradually. Place it on a medium heat for five to eight minutes before increasing the temperature or adding food. This gives the heat time to work its way across the surface more evenly. For baking — think a cast iron skillet cornbread or a traditional Welsh griddle cake — preheating in the oven rather than on the hob gives a much more uniform temperature across the entire surface.

Myth Four: Cast Iron Is Too Heavy for Induction Hobs

With induction hobs becoming increasingly common in British homes — particularly in new builds and kitchen renovations — a surprising number of people believe that cast iron is incompatible with induction cooking. Others worry that the weight of the pan will scratch the glass surface.

Cast iron works perfectly on induction hobs. Because induction cooking works by creating a magnetic field that directly heats ferrous (iron-containing) materials, cast iron is actually one of the most compatible materials possible. It is magnetic, it heats efficiently under induction, and it retains that heat in the way described above.

As for scratching the glass surface, this is a legitimate concern if you drag the pan across the hob. Cast iron pans are heavy — a 26cm Lodge skillet weighs approximately 2.4 kilograms empty — and dragging that across a glass induction surface is asking for trouble. The solution is straightforward: lift the pan rather than sliding it. If the hob surface already has minor scratches from previous cookware, a silicone hob protector mat can be used, though this may slightly reduce the efficiency of the induction transfer.

One genuine issue with induction and cast iron is warping. Cheap, thin cast iron pans can warp over time with repeated induction use because the heating is concentrated in the base rather than radiating from below. Quality cast iron from established brands — Lodge, Netherton Foundry (a wonderful British manufacturer based in Shropshire), or vintage pieces with thick bases — will not have this problem.

Myth Five: Rusty Cast Iron Is Ruined and Should Be Thrown Away

Every weekend, across car boot sales from Carlisle to Canterbury, people walk past rusty cast iron pans convinced they are looking at ruined cookware. This represents an enormous missed opportunity.

Rust on cast iron is surface oxidation. It is iron reacting with moisture and oxygen, a process that is entirely reversible when it has not been left for decades in genuinely destructive conditions. A pan with surface rust — reddish-brown patches, rough texture, perhaps some flaking — can almost always be restored to full working order with some effort.

Moving Forward

Once you have the fundamentals in place, the possibilities open up considerably. The UK offers fantastic opportunities for anyone interested in this hobby, and with the right foundation you will be well placed to make the most of them.