Pick thyme and rosemary leaves and add to a mortar.
Peel and roughly chop garlic and shallots and add to the mortar.
Grind everything to a paste using a pestle, then add the olive oil and season with salt and pepper.
Cut away the rib bones from the meat, rub the meat with the herb rub, and then reattach the bones with butcher string.
At the barbecue:
Prepare your barbecue for indirect heat, approx. 180 °C. If using a 57cm charcoal barbecue, you will need ½ a chimney starter of lit Weber briquettes.
Place the roast on the cooking grate over indirect heat.
Insert an iGrill probe into the meat, close the lid and cook for about 90-120 minutes, or until the core temperature reaches 56 °C.
Remove the roast from the barbecue and rest on a warm plate for about 10 minutes before serving.
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