Sunday afternoon, a leg of lamb in the fridge, and 34 degrees forecast. Running the kitchen oven for three hours heats the whole house, and the air conditioner spends the afternoon fighting it. That is where a BBQ roast stops being a novelty: the hood comes down, the burners under the meat go off, and the barbecue works like an oven parked outside.
This guide covers hooded roasting on a gas barbecue - setting up indirect heat, holding a steady temperature, and knowing when the meat is cooked. It is not about spit cooking; if a turning rotisserie is what you are after, our guide to using a BBQ rotisserie covers that separately. If you are still choosing the barbecue itself, start with the BBQs range.
How a BBQ roast works: indirect heat under the hood
Direct cooking puts food straight over a lit burner. The heat is fierce and comes from below, which is why steaks and snags are done in minutes. A roast handled that way scorches outside long before the centre is ready.
Indirect heat moves the food off the flame. You light the burners on one side or along both outside edges, leave the burners beneath the meat off, and close the hood. Hot air circulates around the food instead of blasting it from underneath. That is an oven, in every way that matters - and because the hood does the work, its construction matters more than the burner count.
Setting up indirect heat on your barbecue
The arrangement changes with the number of burners, but the principle never does: no flame beneath the meat, hood down, and a tray underneath to catch the fat.
| Burners | Indirect set-up | Watch out for |
|---|---|---|
| Two | Light one burner, roast over the unlit side | Heat is noticeably uneven - turn the tray halfway |
| Three or four | Light the outside burners, meat in the middle | A large joint can crowd the middle zone |
| Five or more | Light the outer burners only, or run one end | Easy to overshoot with burners you do not need |
A five-burner cookbox gives you the most room to work with. The Napoleon Rogue XT 625 SIB 5 Burner BBQ ($2,999) lists baking among the things it is built for. Its ACCU-PROBE temperature gauge reads the cookbox with the hood down, which is exactly when you need to know.
Four burners is the common Australian backyard set-up, and it roasts well. Light the two outside burners, leave the middle two off, and the meat sits in the gap. The Coleman Revolution 4 Burner BBQ with Side Burner ($1,749) is listed with a double-layer hood that holds heat for roasting, and its removable grease cup comes out from the front.
Two burners still works; it just asks for more attention. Light one, roast on the other side, and turn the tray around halfway so both ends see the same heat. The Coleman Revolution 2 Burner BBQ ($1,249) suits a courtyard or balcony, and its warming rack sits above the main cooking surface for slow cooking at a lower temperature.
Holding the temperature and checking it properly
You steer a barbecue with burner settings rather than a dial marked in degrees, so the instinct to turn everything up is the one to resist. The hood traps more heat than people expect, and one side running flat out will scorch the near edge of the roast while the far edge sits pale.
Start the lit burners low to medium, close the hood, and give it ten to fifteen minutes to settle before judging anything. Every time you lift the hood you lose the heat you have built, so open it only to baste, turn the tray or take a reading.
Doneness is never a guess. Use a meat thermometer in the thickest part of the meat, clear of bone and clear of the tray, and cook to the safe internal temperatures food authorities publish:
- Poultry, whole or in pieces: 74C
- Mince, sausages and rolled or stuffed cuts: 71C
- Whole cuts of beef, lamb and pork: 63C, then rest at least three minutes
Australian advice often rounds poultry and mince up to 75C, a sound habit outdoors where wind and an opened hood make things less predictable. Rest the meat before carving.
Charcoal changes the flavour, not the method. The Coleman Revolution Dual Fuel BBQ ($2,199) puts a full-size charcoal kettle beside the gas burners, and the kettle takes a hinged lid plus a vent and exhaust system to control temperature and smoke.
Roasting outdoors through an Australian summer
January is the reason most of us learn this technique. Moving the roast outside keeps the heat out of the house, which matters more in Perth or Brisbane than the power bill alone suggests.
Fire restrictions are the thing to check first. Gas barbecues are often treated differently to solid fuel fires when restrictions are declared, but the rules vary by state and council, and a total fire ban day can change them again. Check your state fire service before you light up - the CFA in Victoria, the NSW Rural Fire Service, or the equivalent authority where you live. In an apartment or townhouse, the strata scheme or body corporate may set its own conditions on gas bottles and balcony cooking.
Position counts too. A barbecue in the wind tunnel down the side of the house bleeds hood heat all afternoon and never holds a steady temperature. If you are weighing up a larger barbecue for this kind of cooking, our Napoleon Rogue XT 625 review walks through what a five-burner cookbox gives you.
Hooded BBQ roasting - frequently asked questions
Do I need a drip tray when roasting on a barbecue?
Yes - sit a tray directly under the meat on the unlit side. It catches fat before it reaches the sear plates and burners, which keeps flare-ups and smoke down, and it collects the drippings for gravy. A splash of water or stock stops those drippings scorching.
How do I know when a BBQ roast is cooked?
Check the internal temperature with a meat thermometer in the thickest part of the meat. Colour, time per kilo and prodding are unreliable outdoors, where wind and hood-opening change the pace. Cook to the published safe temperatures, then rest the meat before carving.
Why is my roast pale instead of browned?
The hood temperature is almost certainly too low, or the hood is opened too often. Browning needs sustained heat around the meat, so let the barbecue settle, keep the hood shut, and lift the lit burners a setting rather than moving the meat over a flame.
Should the hood stay closed the whole time?
Mostly, yes - the closed hood is what turns the barbecue into an oven. Open it to baste, turn the tray or take a reading, then close it straight away. Each opening costs heat that takes minutes to build back.
Shop the range
Hooded roasting works on almost any gas barbecue, but a heat-holding hood and enough burners to leave some off make it far easier. Browse Napoleon BBQs and Coleman BBQs to compare cookbox sizes and hood construction. We deliver Australia-wide with free delivery on orders over $100 and most orders dispatched in 3 to 10 business days.
