Cut the beef into 1-inch cubes, then skewer them with bamboo sticks and season the beef with salt and freshly ground black pepper to taste. Pour 2 tablespoons of the olive oil on the beef skewers, lay the rosemary on top of the beef and cover the plate with plastic wrap and refrigerate for 30 minutes. Heat a medium sized frying pan over high heat with 2 tablespoons of olive oil, then place the beef skewers in the pan. After 1 to 2 minutes, flip the beef skewers, at this point lay rosemary in the pan as well. Cook to desired tenderness. Serve with rosemary over the skewers.