Using Cast Iron on an AGA: A Complete UK Guide

The AGA cooker occupies a unique place in British kitchen culture. From farmhouses in the Yorkshire Dales to terraced cottages in Cornwall, these range cookers have been a fixture of British domestic life since Dr Gustaf Dalén introduced them to the UK in the 1920s. Cast iron cookware — whether a seasoned Lodge skillet, a Le Creuset casserole, or a vintage Netherton Foundry piece — is a natural companion to the AGA. Both are built to last a lifetime, both reward patience, and both produce food that simply cannot be replicated on a cheaper setup.

This guide is written specifically for UK cooks using AGAs. It covers which cast iron pieces work best on which AGA hotplates and ovens, how to season and maintain your cookware in the British climate, and how to get the most out of British ingredients and traditional recipes using this timeless combination.

Understanding Your AGA and Why Cast Iron Suits It

Before placing any pan on an AGA, it helps to understand what makes these cookers different from conventional ovens and hobs. An AGA stores heat in its cast iron core, which is kept at a constant temperature 24 hours a day. Traditional two-oven AGAs run a roasting oven at around 230–240°C, a simmering oven at around 130°C, and two hotplates — a boiling plate and a simmering plate — both made of cast iron themselves.

Modern AGAs, including the AGA 60, the AGA R7, and the AGA dual-control models, offer more flexibility with programmable settings and additional ovens. If you own one of these, the principles in this guide still apply, though you have more control over temperatures than traditional always-on models.

Cast iron cookware and AGA hotplates share an essential characteristic: they are both heat reservoirs rather than heat producers. When you place a cold pan on a gas hob, the flame heats the pan. When you place a cast iron skillet on an AGA boiling plate, the plate transfers stored heat into the pan evenly and steadily. This means cast iron heats more uniformly on an AGA than almost any other combination of cookware and heat source available to a home cook.

The Importance of a Flat Base

The AGA hotplate works through direct contact. A pan with a warped or uneven base will heat poorly and may rock, which is both inefficient and dangerous. Always check the base of your cast iron pan before use. Run your hand across the bottom — it should feel completely flat. Most new cast iron pans, including Lodge skillets and Le Creuset frying pans, have flat machined bases that make excellent contact with the hotplate. Older pieces from car boot sales or antique shops should be tested carefully before use.

Choosing the Right Cast Iron for Your AGA

Not all cast iron is equal, and the UK market offers excellent options across a wide price range.

Le Creuset

Le Creuset, the French manufacturer with a major presence in the UK — including a network of outlet stores and stockists such as John Lewis and Lakeland — produces enamelled cast iron that performs superbly on the AGA. Their signature casseroles, braisers, and roasters are ideal for the simmering and roasting ovens. The enamel coating means you do not need to season these pieces, and they are easy to clean, which suits cooks who want minimal fuss.

Le Creuset’s frying pans and grillpans also work well on the AGA boiling plate. Bear in mind that enamelled cast iron is not quite as non-stick as well-seasoned bare iron — you will still need adequate fat for frying.

Lodge Cast Iron

Lodge, the American manufacturer, produces bare cast iron skillets, Dutch ovens, and griddles that are widely available in the UK through Amazon UK, Lakeland, and independent cookware retailers. Lodge pans come pre-seasoned with a vegetable oil finish and are significantly less expensive than Le Creuset. A 26cm Lodge skillet typically costs around £25–£35, making it an accessible entry point.

Bare cast iron from Lodge requires ongoing seasoning (covered in detail below), but many cooks consider this part of the appeal. A well-seasoned Lodge skillet used regularly on an AGA will develop a superb non-stick patina over months and years of use.

Netherton Foundry

For those who want British-made cast iron, Netherton Foundry in Shropshire is the standout option. Their spun iron and cast iron pieces are handcrafted in the Black Country, a region with a centuries-old tradition of metal foundry work. Netherton’s pans are lighter than most cast iron, beautifully finished, and ideally suited to AGA cooking. They are sold directly through the Netherton Foundry website and represent genuine British craftsmanship worth supporting.

Vintage and Second-Hand Cast Iron

The UK has a rich supply of vintage cast iron cookware. Look at car boot sales, local auction houses, and the British cast iron enthusiast groups on Facebook where pieces from defunct British manufacturers such as Aga-Rayburn, Landers Frary & Clark, and various Victorian foundries change hands regularly. Vintage pieces in good condition can be restored through re-seasoning and often outlast modern equivalents. Check that any vintage piece is free from cracks — a cracked pan is unsafe and should not be used.

Setting Up: The AGA Hotplates

The Boiling Plate

The boiling plate runs at high heat — typically around 350°C surface temperature on a traditional AGA. This is where you sear steaks, fry onions, bring large pots to the boil, and cook pancakes. Cast iron is uniquely suited to this temperature because it absorbs and holds the heat from the plate rather than cooling it rapidly the way thin aluminium pans do.

To use a cast iron skillet on the boiling plate:

1. Lift the chrome lid and allow the plate to come back to full temperature if it has been in use recently — the AGA temperature indicator (usually a dial or a light on modern models) will tell you when the plate is ready.
2. Place your cast iron skillet directly on the boiling plate without any oil in the pan first. Allow it to preheat for two to three minutes.
3. Add your fat — beef dripping, lard, rapeseed oil, or butter depending on the recipe — and allow it to heat until shimmering before adding food.
4. For searing meat, press the food firmly into the pan and do not move it for at least two minutes. This builds the Maillard crust that gives properly seared meat its flavour.

One important note: never leave an empty cast iron pan unattended on the boiling plate for more than a few minutes. Overheated bare iron can damage its seasoning and, in extreme cases, the pan itself.

The Simmering Plate

The simmering plate runs at a gentler heat, making it suitable for maintaining a gentle fry, cooking eggs, and keeping sauces moving without reducing them too aggressively. A cast iron skillet placed on the simmering plate after being brought up to temperature on the boiling plate will cook eggs, omelettes, and fish beautifully without burning.

The simmering plate is also where experienced AGA cooks use the cold plain shelf technique — placing the cold shelf above the food in the roasting oven to drop the temperature — though this is more relevant to oven use than hotplate use.

Using Cast Iron in the AGA Ovens

The Roasting Oven

The roasting oven in a traditional AGA runs hot — around 230°C to 240°C — and is the workhorse for most main-course cooking. A cast iron casserole or Dutch oven is ideal here for braises, pot roasts, and slow-cooked stews. The cast iron absorbs heat from all sides in the oven cavity, cooking food evenly without the hot spots that plague thinner pans.

To use a Le Creuset or Lodge Dutch oven in the roasting oven:

1. Begin the dish on the boiling plate — sear your meat, soften your aromatics, build your fond.
2. Add your liquid — stock, wine, cider, or water — and bring to a simmer on the boiling plate.
3. Place the casserole, with its lid on, in the lower half of the roasting oven.
4. After 20 minutes, slide it to the simmering oven if the dish requires a long, slow cook. This is one of the great advantages of the AGA: you can start a dish on high heat and move it to gentle heat without adjusting any settings.

The Simmering Oven

The simmering oven, running at approximately 130°C, is perfect for overnight cooks, slow braises, and dishes that benefit from extended gentle heat. A cast iron casserole of oxtail stew, placed in the simmering oven at 10pm, will be ready and falling off the bone by 8am the following morning. This kind of overnight, hands-off cooking is one of the genuine pleasures of combining an AGA with cast iron.

British cuts that particularly benefit from this treatment include brisket, shin of beef, pig’s cheeks, lamb shoulder, and whole chicken cooked low and slow in stock and root vegetables.

The Warming Oven

Four-oven AGAs include a warming oven, typically running at around 80°C. This is not hot enough to cook in cast iron but is excellent for warming plates and resting meat. A cast iron skillet placed in the warming oven after cooking will retain heat for serving, keeping food warm at the table far more effectively than a thin plate ever could.

Seasoning Cast Iron in the British Climate

Seasoning is the process of bonding polymerised oil to the surface of bare cast iron, creating a non-stick, rust-resistant coating. The UK’s damp climate makes this particularly important — cast iron left unseasoned or stored in a humid environment will rust quickly, especially in older kitchens without climate control.

Initial Seasoning

If you have a new Lodge pan or a stripped vintage piece that needs seasoning from scratch, follow these steps:

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.