Creating the Grilled Steak Bowl with Sauce & Grilled Zucchini is straightforward, especially if you follow these simple steps:

1. Prepare the Marinade: In a bowl, mix soy sauce, balsamic vinegar, honey, Dijon mustard, garlic powder, onion powder, and chopped rosemary (if using).
2. Marinate the Steak: Place the flank steak in a resealable bag or container, pour the marinade over it, and let it marinate for at least 15 minutes (or up to overnight for more flavor).
3. Preheat the Grill: Set your grill to medium-high heat. This will ensure a nice char on your steak and zucchini.
4. Prepare the Zucchini: Slice the zucchinis into half-moons or rounds, depending on your preference. Drizzle with olive oil and season with salt and pepper.
5. Grill the Steak: Remove the steak from the marinade and let excess liquid drip off. Place it on the grill and cook for about 5-7 minutes on each side for medium-rare, adjusting time for your preferred doneness.
6. Grill the Zucchini: While the steak is grilling, place the zucchini on the grill. Cook for about 3-4 minutes per side or until they’re tender and slightly charred.
7. Rest the Steak: After grilling, let the steak rest for about 5 minutes before slicing. This helps retain the juices.
8. Slice the Steak: Cut the steak against the grain into thin slices.
9. Assemble the Bowl: In a large bowl, layer the grilled zucchini and sliced steak. Drizzle with any remaining sauce or additional balsamic vinegar for extra flavor.
10. Garnish: Top with fresh parsley, if desired, to add a splash of color.

Following these detailed steps will ensure that each bowl is flavorful and beautifully presented.