Leg of lamb on the BBQ: juicy recipe with rub and low temperature
BBQ leg of lamb makes a generous main course for 6–8 people. Indirect heat, a suitable rub and a meat thermometer help you control doneness. This recipe offers two methods for a leg of about 2 kg; timings are guides, not guarantees of juiciness or a pink centre.
Why cook leg of lamb on the BBQ?
Leg of lamb comes from the hind leg and can be relatively lean, especially after visible fat is trimmed. It is not lamb shoulder: shoulder generally contains more fat and connective tissue and often needs a different approach. For this recipe, use a whole, unstuffed leg and check temperature in several places.
Ingredients for 6–8 servings
- 1 leg of lamb, about 2 kg, bone-in or boneless
- 2 tsp coarse sea salt for the dry brine
- 3–4 tbsp Shawarma BBQ Dry Rub or Toscana Fire Italian BBQ Rub
- 2 tbsp olive oil
- 4 garlic cloves, sliced
- Rosemary sprigs, optional
Preparation: dry brine 24 hours ahead
Pat the leg dry and distribute the salt evenly. The listed quantity is 2 tsp, not an additional generous layer on top. Account for salt in your rub and reduce the separate salt if needed. Place the leg on a rack over a tray in the refrigerator for about 24 hours. Keep raw meat juices away from other foods.
Keep the meat refrigerated until preparing the BBQ; there is no need to leave it at room temperature for 1–2 hours. Distribute the garlic slices and optional rosemary over the outside when seasoning rather than inserting them deep into the meat. For stuffed or formed products, follow the supplier’s specific cooking instructions.
Cooking: two methods
Method A: low & slow on the smoker
Coat the leg with the olive oil and the listed 3–4 tbsp of rub. Stabilise the smoker at 120–130°C (248–266°F) and cook indirectly with the lid closed. Apple or cherry are possible smoking woods; use an amount to suit your taste. For about 2 kg, use 3–4 hours as a rough planning guide, but shape, bone, starting temperature and BBQ setup determine the actual time.
This recipe uses a target range of 65–68°C (149–154°F, rounded). Check several places in the thickest meat, avoiding bone. This range does not guarantee pink meat. Do not remove a whole cut of lamb below 63°C (145°F, rounded) expecting it to reach the minimum during resting. Then rest for at least 3 minutes.
Method B: indirect heat on the BBQ
Set up the BBQ for indirect cooking around 160°C (320°F). Coat the leg with the listed oil and rub, then cook with the lid closed using the same temperature checks and target range of 65–68°C (149–154°F, rounded). For extra colour, optionally finish briefly over direct heat: watch closely, turn regularly and stop once sufficiently browned. Do not use a fixed final 10 minutes over direct fire. Check the centre again after searing and rest the meat.
Internal temperature and food safety
For whole cuts of lamb, the USDA minimum is 63°C (145°F, rounded), measured before removal from the heat, followed by at least 3 minutes of rest. Lower temperatures in culinary doneness charts are not equivalent to that safety advice. Colour alone does not show whether meat has been heated sufficiently.
| Description | Internal temperature | Meaning for this recipe |
|---|---|---|
| Rare | 52–54°C (126–129°F, rounded) | Below the stated safety baseline; not this recipe’s target |
| Medium-rare | 57–60°C (135–140°F, rounded) | Below the stated safety baseline; not safety advice |
| Whole-cut safety baseline | At least 63°C (145°F, rounded) | Follow with at least 3 minutes of rest |
| Recipe target range | 65–68°C (149–154°F, rounded) | Measure doneness; a pink centre is not guaranteed |
| Further cooked | 70°C (158°F) or higher | May be firmer; dryness also depends on time and method |
Resting and carving
Rest the cooked leg for about 15–20 minutes, loosely covered on a clean plate. This is a practical resting time for a large cut; the safety guidance above specifies a minimum of 3 minutes. The centre may continue to rise in temperature while resting. For a bone-in leg, first carve the meat away from the bone. Separate muscle sections if needed and slice each across its grain.
Serving suggestions
- Tzatziki or yoghurt-mint sauce
- Grilled peppers, aubergine and courgette
- Flatbread or pita
- Tabbouleh or couscous
- Roast potatoes with rosemary
Which rub works with leg of lamb?
- Shawarma BBQ Dry Rub: cumin, coriander, cinnamon and allspice for a warm, aromatic profile.
- Toscana Fire Italian BBQ Rub: fennel seed, smoked paprika, allspice and cayenne. The separate garlic and optional rosemary in this recipe are additional seasonings, not the defining ingredients of this rub.
Practical tips
- Check several places: shape and thickness vary, with or without bone.
- Use doneness and temperature as your guide; time and meat colour alone are insufficient.
- Choose smoking wood to taste; apple and cherry are options, not mandatory or always better.
- When searing directly, watch for fat flare-ups and rub that may darken too much.
- Boneless can be easier to carve, but does not automatically cook more evenly.