Nutritionally, a 100-gram serving of sirloin steak contains approximately:

• Calories: 250 
• Protein: 25g 
• Fat: 16g (saturated fat: 6g) 
• Iron: 15% of the daily value (DV) 
• Zinc: 28% of the DV 
• Vitamin B12: 110% of the DV 

1. GRILLING
Preheat the grill to high heat. Brush the steak with olive oil and season with salt and pepper. Grill the steak for 4-5 minutes per side for medium-rare, or until internal temperature reaches your desired level of doneness. Let the steak rest for 5 minutes before serving. 

2. PAN-SEARING
Heat a cast-iron skillet over medium-high heat. Brush the steak with olive oil and season with salt and pepper. Sear the steak for 2 minutes per side, then transfer the skillet to a preheated 400°F (200°C) oven and cook for an additional 4-5 minutes for medium rare or until the internal temperature reaches desired doneness. Let the steak rest for 5 minutes before slicing and serving.