||Cut each sirloin steak into cubes, thread on to metal skewers with red onion wedges. Brush each skewer lightly with oil. Season each with ground pepper.
||Preheat the char-grill pan to hot before adding the skewers. Cook skewers for about two minutes for each of the four sides.
||Remove the skewers from heat, loosely cover with foil and rest for two minutes before serving.
||Serve skewers with warm tomato vinaigrette.
||<strong>To make the warm tomato vinaigrette</strong>: heat the oil in a small pan, add the tomatoes, shallots, sugar, salt, pepper and parsley. Cook over a high heat for one minute to just soften the tomatoes. Stir in red wine vinegar.