Creating Rosemary Garlic Steak Kebabs is straightforward. Follow these steps for guaranteed success:

1. Prepare the Marinade: In a large bowl, whisk together the olive oil, chopped rosemary, minced garlic, soy sauce, red wine vinegar, Dijon mustard, salt, and pepper.
2. Marinate the Steak: Add the steak cubes into the marinade, ensuring they are well coated. Cover and refrigerate for at least 30 minutes (up to 1 hour for more flavor).
3. Prep Skewers and Vegetables: While the steak marinates, soak wooden skewers in water if using, to prevent burning. Prepare the bell pepper, onion, and zucchini by cutting them into compatible sizes.
4. Assemble Kebabs: Once marinated, take the steak and vegetables out. On each skewer, alternate threading steak and vegetables, leaving a little space between them to ensure even cooking.
5. Preheat the Grill: Heat your grill to medium-high heat. It should be hot enough to create grill marks on the skewers.
6. Grill the Kebabs: Place the kebabs on the grill. Cook for about 15-20 minutes, turning occasionally, until the steak is cooked to your preferred doneness and the vegetables are tender.
7. Rest and Serve: Remove the kebabs from the grill, let them rest for a few minutes before serving, allowing the juices to redistribute.

These simple steps will guide you in creating delightful Rosemary Garlic Steak Kebabs everyone will enjoy!