Step 1

In a bowl, whisk together olive oil, soy sauce, Worcestershire sauce, minced garlic, brown sugar, and black pepper.

Step 2

Place the steak cubes in a zip-top bag or shallow dish. Pour the marinade over the steak and let it sit for at least 30 minutes in the refrigerator for maximum flavor.

Step 3

Thread the marinated steak cubes onto skewers, alternating with bell peppers, onion, mushrooms, and zucchini slices.

Step 4

Preheat your grill or grill pan to medium-high heat. Cook the kabobs for 10-15 minutes, turning occasionally, until the steak reaches your desired doneness.

Step 5

Remove the kabobs from the grill and let rest for 5 minutes. Serve hot with your favorite sides.