A spit braai slowly roasts a whole lamb, pig or large joint on a turning spit over coals. Plan on roughly 4 to 6 hours for a whole lamb, depending on its size and whether it’s deboned, and always confirm doneness with a meat thermometer rather than the clock. This guide covers sizing, timing, the fire, food safety, and whether to do it yourself or hire a spit braai caterer.
How a spit braai works
The meat is skewered on a long steel spit and secured with forks and wire so it can’t slip as it turns. A motor (or a patient helper) rotates the spit slowly above a bed of coals, so the meat cooks evenly and bastes itself in its own fat. Most spit braai machines have a firebox or tray underneath for coals, with adjustable height so you can raise or lower the meat.
Common options:
- Whole lamb (the classic South African choice)
- Whole sucking pig or a half pig
- Deboned and rolled lamb, which cooks faster and carves more easily
- Large joints such as a leg of lamb, pork shoulder or a rolled beef rib, on a smaller rotisserie
How big a lamb do you need?
A whole lamb on the spit is often quoted as feeding roughly two people per kilogram when served with sides. Treat that as a starting point and scale up if the meat is the whole meal.
| Guests (with sides) | Suggested option | Approx. carcass weight |
|---|---|---|
| 15–20 | Large joint or small lamb | 8–10 kg |
| 25–30 | Small to medium lamb | 12–15 kg |
| 35–40 | Medium to large lamb | 17–20 kg |
| 50+ | Two lambs, or lamb plus a pig | 2 × 15–20 kg |
Very large lambs aren’t always better. Over about 20 kg the animal tends to be fattier and takes much longer to cook through, so two smaller carcasses may be easier than one giant one. Order through a butchery a week or more in advance and ask them to prepare it for the spit. For smaller groups, see our table of braai meat per person instead.
Spit braai timing per kg
There is no single agreed rule. Published guides vary a lot, because coal heat, wind, the distance from the coals, bone-in versus deboned, and the outside temperature all change the time. The ranges below are approximate starting points from commonly cited spit-roast guidance:
| Meat | Approx. weight | Approx. time over steady coals |
|---|---|---|
| Whole lamb, bone-in | 10 kg | about 4 hours |
| Whole lamb, bone-in | 15 kg | about 4–5 hours |
| Whole lamb, bone-in | 20 kg | about 5–6 hours |
| Deboned, rolled lamb | 15–18 kg | about 3–4 hours |
| Leg of lamb or pork shoulder | 2–3 kg | about 1.5–2.5 hours |
| Whole pig | 20–30 kg | 5 hours or more |
As a rough rule, that works out to around 15–25 minutes per kilogram for a whole bone-in lamb, so build in at least an hour of buffer. It is far easier to keep cooked meat warm than to keep 40 hungry guests waiting.
Doneness and food safety
Timing gets you close; a meat thermometer tells you when it’s safe. Check the thickest parts, such as the leg and shoulder, without touching the bone.
| Meat | Minimum internal temperature | Notes |
|---|---|---|
| Lamb, beef (whole cuts) | 63°C, then rest | Many people prefer lamb on the spit well done, 70°C+ |
| Pork | 63°C, then rest | Pulled-style pork goes higher, about 90°C |
| Rolled or stuffed meat | 71°C | Mincing or rolling can carry surface bacteria into the centre |
| Poultry | 74°C | Including any stuffing |
Also:
- Keep the carcass cold (in a cold room or with ice) until it goes on the spit.
- Wash hands and boards after handling raw meat.
- Carve and serve promptly, and refrigerate leftovers within two hours.
How to spit braai a lamb, step by step
- Prepare the lamb. Pat it dry, trim loose fat, and season inside the cavity with salt, pepper, garlic and herbs (rosemary works well).
- Mount it on the spit. Push the spit through the centre along the spine. Fix the forks at both ends and tie the spine, legs and shoulders tightly to the spit with stainless steel wire, so the carcass turns with the spit rather than flopping.
- Check the balance. Turn the spit by hand. If one side drops, reposition before it goes over the fire. A balanced spit puts less strain on the motor and cooks evenly.
- Light plenty of coals. Start a separate fire or a bank of charcoal next to the machine. You will need a steady supply for hours. Our charcoal and briquettes guide helps you estimate fuel, and some spit-roast guides suggest about a kilogram of charcoal per kilogram of meat, added in stages.
- Start high and gentle. Spread coals under the thicker parts (shoulders and legs) rather than the thin middle, and keep the meat fairly high at first. You want gentle heat, not flames.
- Maintain the fire. Add fresh coals from the side fire every 30–45 minutes. Lower the spit gradually as cooking progresses.
- Baste. Every 30 minutes or so, baste with a mix of oil, lemon juice, garlic and herbs, or a simple salt-water baste.
- Crisp the skin. In the final half hour, lower the meat or add coals for colour and crackling.
- Check and rest. Confirm temperatures in several places, then rest the meat for 15–20 minutes before carving.
DIY vs hiring a spit braai caterer
| DIY (hire or own the machine) | Spit braai caterer | |
|---|---|---|
| Cost | Lower: meat, fuel and machine hire | Higher: you pay for staff, sides and expertise |
| Effort | High: 6+ hours of fire-tending | Low: they arrive, cook and carve |
| Risk | Timing and doneness are on you | The caterer carries the risk |
| Extras | You make the sides | Usually include salads, rolls, pap and sometimes crockery |
| Best for | Experienced braaiers, family events | Weddings, corporate events, 50+ guests |
When hiring a caterer, ask: what’s included per head (sides, bread, cutlery, staff), how long they need on site, what they need from you (space, water, power), whether they bring their own machine, and what happens with leftovers. Get at least two quotes and ask for references from recent events.
When hiring only the machine, check that it has a motor, the spit length fits your carcass, forks and wire are included, and the hire company explains setup.
Safety
- Set up on level, non-flammable ground, away from buildings, thatch and dry grass.
- Keep children and pets clear of the machine and the coal fire.
- Check any motor power cable is outdoor-rated and kept away from heat.
- Keep a fire extinguisher or a hose nearby. See our fire extinguisher guide.
- Never leave the fire unattended, and douse coals completely when you’re finished.
For more ways to feed a crowd from the coals, see our braai ideas.
FAQ
How long does it take to spit braai a 15 kg lamb?
Plan for roughly 4–5 hours over steady coals, plus an hour of buffer. A deboned, rolled lamb is quicker. Confirm doneness with a thermometer in the leg and shoulder.
How many people does a lamb on the spit feed?
A rough guide is about two people per kilogram when served with sides, so a 20 kg lamb feeds around 40. Allow more if the meat is the only dish.
Do I need a motor for a spit braai?
Not strictly, but turning a spit by hand for five hours is a lot of work. Most hire machines come with an electric motor; some have battery or solar options for venues without power.
What should I serve with a spit braai?
Rolls, potato salad, a green salad, pap and sous, and roast vegetables. Our braai salads guide has quantities for a crowd.
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