Bring beef rump to room temperature 30 minutes before cooking.Sprinkle the rock salt all over the meat.Secure rump.Add the meat skewer to a rotisserie grill, allowing the meat to turn.Otherwise, place it on the barbeque grill, over medium heat, with the fat side down.
Cook, rump until a core temperature of between 58◦C- 65◦C for medium is reached or until cooked to your liking.Tap skewer to knock off any extra salt. Transfer to a tray, cover loosely with foil to rest for half the cooking time.
Serve with chimichurri sauce, roasted bell peppers and a green salad.