Cut steak, peppers, and onion into similar-sized chunks for even cooking. Keep mushrooms whole or halved if large.
1 ½ pounds top sirloin steak, ½ red bell pepper, ½ green bell pepper, 1 red onion, 6 ounces portobello mushrooms
In a small bowl, whisk together garlic, olive oil, honey, paprika, salt, and pepper.
3 garlic cloves, 3 tablespoons olive oil, 2 tablespoons honey, 1 ½ teaspoons ground paprika, Salt and pepper
In a large bowl, combine steak, peppers, onions, and mushrooms. Pour the marinade over the mixture and toss to coat well. Cover and refrigerate for 30 minutes to 4 hours.
Preheat the Grill (Start 20 minutes before grilling): For charcoal grills, arrange coals to one side for indirect heat. For gas grills, set all burners to high. Aim for 400°F (200°C).
Thread marinated steak and veggies onto skewers, alternating for even cooking and color.
Grill over medium heat for 12–15 minutes, turning occasionally, until the steak is nicely charred and cooked to your preferred doneness.