Metal skewers, or wooden skewers soaked in water for 30 minutes before cooking
STEAK SAUCE1 Place the potatoes in a pot, fill it with water, season with salt and set it over high heat. Cook until the potatoes are just tender; about 15 minutes. Drain.
2 Preheat the barbecue on high. Season the sirloin with salt and lots of black pepper. Thread the skewers with chunks of sirloin and the potatoes.
3 Make the steak sauce: combine the tomato sauce, mustard, brown sugar, honey, horseradish and Worcestershire sauce in a mixing bowl and set it aside.
4 Barbecue the skewers for five minutes, then baste with the steak sauce and turn the skewers. Continue cooking until the steak is browned and slightly firm to the touch; about five minutes more. Serve the skewers with the remaining sauce for dipping.1850kJ per serve