Iwachu: the story behind Japan's most iconic ironware brand

Iwachu was founded in 1902, but the tradition it belongs to - Nambu tekki ironware - is older by three centuries. In the kitchenware world, where brands appear and disappear within a decade, over a hundred years of continuous production in the same city, using a craft technique that has not fundamentally changed, is remarkable. Their pieces are found in museum collections. They are also used daily in ordinary kitchens, which is precisely the point.

Nambu tekki: the tradition behind the brand

Nambu tekki takes its name from the Nanbu domain, which governed the Morioka and Mizusawa areas of present-day Iwate Prefecture from the early 17th century. The local lord brought skilled metalworkers to the region to produce tea kettles and iron pots for his household. Over the following two centuries, the craft became associated with the region in the same way that Tokoname became associated with teapots or Hasami with porcelain.

Iwachu is one of the few remaining large-scale producers making pieces in the traditional Nambu tekki manner. Their manufacturing facility remains in Morioka, where the distinctive sand-casting process was originally developed.

How each piece is made

Sand casting is a demanding process. Each mould is packed by hand, which means no two pieces are identical. Molten iron at around 1400 degrees Celsius is poured into the mould and allowed to cool slowly over several hours. The casting is then removed, cleaned, inspected, and treated to prevent rust. The final surface - that characteristic pattern of small geometric bumps - is formed during the moulding process and serves a functional purpose: it increases the iron's surface area and contributes to more even heat distribution during use.

Where to start

For most people, a tetsubin kettle is the right first Iwachu purchase. It is immediately useful for heating water for tea or coffee, beautiful on the stovetop, and straightforward to maintain. Browse our Iwachu collection for kettles, skillets and pots. For a broader view of the tradition, explore our full cast iron cookware range.

Care that actually matters

The rule that breaks more Iwachu pieces than anything else: leaving them wet. After every use, rinse with hot water while still warm, scrub gently with a tawashi brush, then dry immediately over low heat on the stovetop. While still warm, apply a thin coat of neutral oil with a cloth and wipe off excess. This routine takes about two minutes and adds decades to the piece's life. Never put cast iron in the dishwasher. Never leave it to air-dry.

Also worth exploring: Oigen, a Nambu ironware maker with a parallel heritage and a distinct product range, and our full kettles collection.

Read next

• The beginner's guide to Japanese cast iron cookware, seasoning and care before you buy your first piece
• How to make takoyaki at home, using the Iwachu pan
• Sori Yanagi: the designer who made cookware beautiful