Creating delicious grilled steak kabobs is a breeze when you follow these simple steps:

1. Prepare the Marinade: In a bowl, whisk together the olive oil, soy sauce, balsamic vinegar, minced garlic, Worcestershire sauce, oregano, black pepper, and salt.
2. Cut the Steak: Trim any excess fat from the sirloin steak and cut it into 1-inch cubes.
3. Marinate the Steak: Place the steak cubes in the marinade, ensuring they are well coated. Cover and refrigerate for at least 30 minutes or up to 4 hours for more flavor.
4. Prepare the Vegetables: While the steak marinates, wash and cut the bell peppers and onion into 1-inch pieces. Leave the cherry tomatoes whole.
5. Soak Wooden Skewers: If using wooden skewers, soak them in water for at least 30 minutes to prevent burning on the grill.
6. Assemble the Kabobs: Alternate threading the marinated steak and vegetables onto the skewers. Leave a little space between each piece for even cooking.
7. Preheat the Grill: Heat your grill to medium-high heat. If using a gas grill, ensure it reaches around 400°F (200°C).
8. Grill the Kabobs: Place the skewers on the grill and cook for 10-15 minutes, turning occasionally, until the steak reaches your desired doneness (medium-rare is about 135°F or 57°C).
9. Rest the Kabobs: Once cooked, remove the kabobs from the grill and let them rest for a few minutes before serving.
10. Serve: Enjoy your grilled steak kabobs as is or with your favorite dipping sauce.

These steps will guide you in creating mouthwatering grilled steak kabobs that everyone will love!