How to use a konro grill with binchotan

Why binchotan is hard to light

Binchotan is fired so hard that it ends up close to pure carbon, and that density is the whole reason a match does nothing to it. It's made from ubame oak, carbonised slowly in a kiln and finished at around 1,000°C, then raked out glowing and smothered in a damp mix of earth, sand and ash to cool. That pale coating is where the name white charcoal comes from. Knock two pieces together and they ring like metal instead of knocking like wood.

You get something back for the trouble. It holds a steady heat for hours, it barely smokes, and clean binchotan doesn't put any smell into the food.

One thing to sort out before you strike a match: binchotan that has taken on moisture can pop. The Japanese word for it is bakucho. Water trapped inside a piece flashes to steam and splits it open, and hot fragments fly. Keep the bag closed, store it somewhere dry, dry out any piece that got damp, and bring the fire up slowly. Once a piece is glowing red it has stopped being a problem.

How do you light it?

Light it slowly, outdoors, in a chimney starter sitting over an existing flame. Never straight off a firelighter alone, and never on a portable butane cartridge stove, where the gas canister sits right next to all that heat.

Load the chimney loosely so air can move through it. Put a couple of firelighters or a decent handful of ordinary lump charcoal underneath. Give it about ten minutes before you expect to see much; that's roughly when the first third of the load starts to catch. Then fan it, gently, and keep going until the pieces glow and begin to grey over. Fifteen minutes in the chimney is normal and longer is fine. If you're bringing binchotan up on a bed of existing embers rather than paper, start an hour before you want to cook.

Two habits that save you. Don't rush it with a torch on full. And don't tip half-lit pieces into the grill hoping they'll come good, because they won't, and cold pieces are what smoke.

How do you set up a konro for two-zone cooking?

Bank all the lit coals under one half of the konro and leave the other half empty. That's the whole trick, and it's what makes a small grill workable.

A konro is usually cut or pressed from diatomite, which is fossilised diatom shells, mostly silica. In Suzu on the Noto peninsula they cut it out of the ground in blocks, carve it, and fire it in a kiln for about a day and a night. Kinka, the manufacturer that makes diatomite konro and shichirin bodies from Noto diatomite, states the material's fire resistance as roughly 800 degrees to 1,000 degrees Celsius, well past anything the coals themselves reach. Diatomite insulates well, which is why the body doesn't heat up the way metal does, though it still gets hot close to the fire, so don't assume any part of it is safe to grab.

Hot side: skewers, the first sear, anything with fat on it. Empty side: where you park something to finish through, and where a flaring skewer goes. Binchotan has little left in it to burn off, so flare-ups are less common than with regular charcoal, but they still happen, and having somewhere to move to beats blowing on it.

Height matters more than people expect. Sit small skewers close to the coals and lift a thick piece higher. If your grill has two rack positions, use both.

Skewers move food between the two sides. We carry the Echo stainless slide skewer, 45cm long at $5.95, with a slider that pushes cooked food off the blade, and a ten-piece stainless barbeque skewer set at $11.95, flat-bladed so food doesn't spin as you turn it. If a grill's mesh wears through, we stock disposable Echo grill mesh at $23.10 for a pack of ten, and a reusable replacement net for the Kinka hibachi grill line, priced from $17.95 to $79.95 depending on the model.

How do you put it out and use it again?

Lift the coals out one at a time with tongs into a hikeshi-tsubo, put the lid on, and walk away. A short, sturdy pair works best close to the heat; we carry the Echo stainless yakiniku tongs, 16cm for $4.50, small enough for the kit but firm enough for hot coals. The fire goes out because the air runs out. Leave the lid shut until the charcoal is fully out, which usually takes a good while, and stand the pot on something that doesn't mind heat, because the base gets very hot.

The reason for a pot rather than a bucket is that binchotan relights. What comes out the next morning is fuel, not waste, so this is the cheap part of owning it.

What you never do is throw water on coals sitting in the konro. Ash goes everywhere and the steam will scald you. The sudden temperature drop can also crack the body of the grill. Diatomite is very weak to water, so you don't wash a konro at all; knock the ash out once it's cold and leave the marks on it.

Is it safe indoors or on a balcony?

No. Charcoal burns outside, in open air, every time. NSW Health says never to use a BBQ or an outdoor heater inside, because any device burning fuel can make carbon monoxide even when there's no smoke. Carbon monoxide can't be seen, tasted or smelled. It shows up as headache, nausea, vomiting or weakness, and a heavy exposure means fainting, permanent brain injury or death.

Treat an enclosed balcony, a garage with the door up, or a room with a window open as indoors. None of them count as open air.

If you live in an apartment there's a second question, and it isn't a safety one. Strata by-laws vary from scheme to scheme, and plenty of buildings have a by-law covering barbecues and smoke drift on balconies. Ask your strata committee secretary or manager for your scheme's by-laws and read them before you buy a grill. I can't tell you what your building allows. I can only tell you it's written down somewhere and worth reading first.

Is binchotan worth it?

Tosa binchotan gives long-lasting heat without transferring odour to food. Its density lets it burn longer than ordinary charcoal, and extinguished pieces can be relit. The trade is patience: allow ten to fifteen minutes and use a chimney starter or a bed of embers.

Priced by weight, our own Tosa binchotan listings work out to about $34.98 a kilogram for the 2kg bag at $69.95, and about $31.98 a kilogram for the 3kg bag at $95.95, cheaper per kilogram in the bigger bag. The Okunoto konro grills, made by Kinka, run from $359.95 to $719.95 across the sizes we carry. Both the charcoal and the grills are sold out at the time of writing; check the BBQ konro grill shelf for restocks.

Quick answers

These are the questions people ask us most often about binchotan, answered briefly.

How long does binchotan take to light? Give it about ten minutes in a chimney starter before the first third catches, and around fifteen minutes before the pieces glow and grey over. If you're lighting from a bed of existing embers instead, start an hour before you want to cook.

Can I use a konro indoors? No. NSW Health says never to use a BBQ or outdoor heater inside, because anything burning fuel can produce carbon monoxide even with no visible smoke. An enclosed balcony or a garage with the door up counts as inside.

Why is my binchotan popping and throwing sparks? It has taken on moisture. Water inside the piece turns to steam and splits it, which Japanese grillers call bakucho. Store it sealed and dry, dry out any damp piece, and heat it slowly; once it's glowing red it stops.

Can I put charcoal out with water? Not on the grill. Lift the coals into a hikeshi-tsubo and close the lid so the fire smothers itself. Pouring water on charcoal sitting in a shichirin scatters ash and risks cracking the body.

How do I clean a diatomite konro? You don't wash it. Diatomite is very weak to water, so let the grill go cold and knock the ash out rather than rinsing it.

Am I allowed a charcoal grill on my apartment balcony? That depends on your building. Strata by-laws vary from scheme to scheme, and many schemes have a by-law about balconies and smoke. Ask your strata committee secretary or manager for your scheme's by-laws and read them first.