The difference between a steak that takes a hard, smoky crust and one that turns grey at the edges is rarely the steak. It is the fire beneath it. Building stable cooking coals is the foundational skill of live-fire cooking: a calm, dense bed of heat that lets you cook with intent rather than chase flames around the grill. Get it right and the whole cook feels different – cleaner smoke, better colour, more control and a proper excuse to stay by the fire with a drink in hand.
Start with fuel that earns its place
Stable coals begin with decent fuel. Dry, seasoned hardwood burns down into long-lasting embers with a clean aroma and reliable heat. Dense hardwood is particularly useful when you are cooking larger cuts, feeding a crowd or working through a long afternoon of grilling. It creates a coal bed with substance, rather than a short burst of flame followed by nothing worth cooking over.
Lump charcoal gives fast, clean heat and is ideal when time is short or you want a concentrated grilling zone. Hardwood logs give you more theatre, more smoke character and a continual source of fresh coals. Many serious fire cooks use both: charcoal to establish an even base, then hardwood splits or chunks to keep the coal supply moving.
Avoid wet timber, treated wood, painted offcuts and soft, resin-heavy timber. They produce harsh smoke, erratic flames and flavours no good piece of meat deserves. Firewood should feel dry, sound sharp when knocked together and be stored off the ground under cover with airflow around it.
Build the fire beside the food zone
The most useful fire is not always directly beneath your cooking grate. On a parrilla or open grill, build your main fire to one side, leaving room to rake finished coals into the area beneath the food. This is how you separate fire-making from cooking. It also keeps you from dropping a fresh, sooty log under a beautiful rib eye halfway through the cook.
Start with a small, well-ventilated structure of kindling and a few modest pieces of hardwood. Let it establish before adding larger logs. The aim is not a towering bonfire. You want a fire with enough oxygen to burn cleanly and enough mass to produce glowing embers over time.
Once the first logs have burned down, use a solid fire tool to pull the glowing material apart. Blackened timber that is still holding its shape is not yet a cooking coal. Give it time. A ready coal is mostly red or orange at its core, covered with a light grey ash and firm enough to be moved without collapsing into dusty fragments.
Flames are for making coals, not proving a point
A flame looks impressive, but it is an unreliable cooking partner. Food placed over active flames can char before the centre has a chance to cook, particularly with fatty cuts that trigger flare-ups. Flame has its place for quick blistering, finishing vegetables or giving a chop a final kiss of heat. For the main event, the steady radiant heat of coals is where the control lives.
If you are cooking with a height-adjustable grill, raise the grate while the fire is still lively. As the flame settles and the coal bed develops, bring the grate down in stages. That adjustment is not a trick. It is the advantage of cooking with equipment designed to work with fire, rather than merely contain it.
Building stable cooking coals in layers
A strong coal bed is built in layers, not dumped in one hot pile. Rake a foundation layer across the cooking zone first, then add more coals where you need power. For most grilling, a bed around 5 to 8 centimetres deep gives enough stored energy to sear well without burning out the moment food hits the grate.
Keep the distribution deliberate. A compact pile creates an intense direct-heat zone for searing steaks, lamb cutlets or skin-on chicken. A thinner, wider layer gives a gentler zone for sausages, fish, vegetables and food that needs time without punishment. Leave part of the grill with few or no coals beneath it. That cooler territory is your insurance policy when fat renders fast or a crust develops ahead of schedule.
Think of the grill as a landscape rather than a single temperature. You need a hot zone, a medium zone and a resting zone. With those three areas in play, you can sear a steak hard, shift it away to finish, then hold it in a warm spot while the rest of the table catches up.
The hand test can offer a rough read, but it is no substitute for observation. At a safe distance above the grate, fierce heat that feels uncomfortable almost immediately signals a serious searing zone. More useful still is watching how your food responds. If oil on vegetables is smoking heavily before they soften, or chicken is blackening while still raw at the bone, either lift the grate, spread the coals or move the food.
Feed the fire before it needs feeding
The coal bed begins to fail well before it goes cold. Its colour dulls, the heat becomes patchy and food takes longer to respond. Do not wait until your guests are staring at half-cooked dinner. Add fresh hardwood to the side fire early, so it has time to burn cleanly into the next round of embers.
This is the rhythm of a good live-fire cook: make coals, rake coals, cook, replenish, repeat. It is less frantic when you accept that maintaining the fire is part of the job. A purpose-built brasero or dedicated side area makes this easier, containing the burning logs while allowing air to move through them.
When replenishing, do not bury your existing cooking bed beneath unburned wood. That drops the temperature and introduces smoke at the wrong moment. Build new fuel beside the active zone, wait for it to break down, then rake only the finished coals into place. A long-handled rake, shovel and coal tongs give you the reach and control to do this safely without rushing.
Ash is useful, until it is not
A thin coating of ash on each coal is a good sign. It shows the coal has settled into a clean, even burn. But a deep layer of ash beneath the fire can choke airflow, especially in a brazier, fire pit or grill with a shallow base. If the coals are struggling despite good fuel, gently move excess ash aside or clear it once the fire is safely out and cold.
Do not overwork the bed. Constant raking breaks coals down, sends ash airborne and creates temperature swings. Make purposeful adjustments, then give the fire a moment to settle. Good fire management is calm work.
Match the coal bed to what is on the grill
There is no single perfect arrangement because a whole pumpkin, a butterflied chicken and a thick sirloin ask different things from the fire. A thick steak benefits from a concentrated coal bed for the initial sear, followed by a move to medium heat. Chicken needs a broader, gentler bed and enough distance from the coals to render its skin without scorching it. Fish generally wants a clean, moderately hot zone and a grate that is properly heated and brushed.
For low-and-slow cooking, build coals at one end and cook at the other with the lid or a suitable cover managing the heat. Add small amounts of fuel steadily instead of throwing on a large log that spikes the temperature. For vegetables, use the edges of the coal bed. This is where onions sweeten, corn chars in patches and capsicum takes on smoke without turning bitter.
Wind changes the equation. A breezy Australian afternoon can make a fire burn hotter on one side and race through fuel faster than expected. Position the grill safely, use wind protection where appropriate and expect to replenish more often. Never compromise ventilation or fire safety to tame the breeze.
Give the coals the respect they demand
Live fire is generous, but it is not forgiving. Set your grill on stable, non-combustible ground, keep children and pets clear of the working area, and have water or an appropriate fire extinguisher close by. Check local fire restrictions before lighting up, especially through the hotter, drier months.
Wear proper fire gloves when handling hot tools, and never leave the fire unattended while it is active. When the cook is over, spread remaining coals out so they cool faster, then allow them to go completely cold before disposal. Coals that look dead can retain dangerous heat for hours.
At Smokin’ Gauchos, we see fire cooking as more than dinner. It is the steady work of reading heat, tending timber and bringing people close while something good takes shape over the coals. Build a bed with patience, keep a second fire producing fresh embers, and your grill will reward you with the kind of food people talk about long after the plates are cleared.