In a medium bowl, whisk together all the marinade ingredients: 1/4 cup soy sauce, 1/4 cup olive oil, 2 tbsp monk fruit/erythritol, 1 tbsp red wine vinegar, 1 tsp ginger garlic paste, 1 tbsp lemon juice, 1 tsp crushed pepper, 1/2 tsp Dijon mustard, 1 tbsp balsamic vinegar, and 1/2 tsp baking soda. Whisk until everything is well-mixed and uniform.
Add the beef cubes to the bowl with the prepared marinade. Mix well, ensuring that all the meat pieces are thoroughly coated. Cover the bowl and transfer it to the refrigerator. Allow the beef to marinate overnight for the best flavor and tenderness, or for a minimum of 2 hours if you're short on time.
While the beef is marinating or just before grilling, prepare your vegetables. In a separate bowl, place the cremini mushrooms, red bell pepper, yellow pepper, green pepper, and onion, all diced into chunks. Season them with 1/2 tsp seasoning salt and 1/2 tsp black pepper, then drizzle with 1 tbsp olive oil and mix well to coat.
Preheat your grill to 425 degrees Fahrenheit. Ensure your grill grates are clean to prevent sticking. While the grill heats, make sure your 8 wooden skewers have been soaked in water for at least 30 minutes to prevent them from burning during grilling.
To assemble, begin threading the marinated beef cubes and seasoned vegetables onto the soaked wooden skewers. You can arrange them in any alternating pattern you prefer. A common method is to start and finish with a piece of beef, creating a visually appealing and balanced kebab.
Carefully place the assembled kebabs on the preheated grill. Grill for 7 minutes. After 7 minutes, use tongs to flip the kebabs. Continue to cook for another 3-5 minutes, or until the beef reaches your desired doneness (medium-rare to well-done), and the vegetables are tender-crisp with nice char marks.
Once cooked, remove the kebabs from the grill. Place them on a platter and let them rest for at least 5 minutes before serving. This resting period allows the juices in the beef to redistribute, resulting in more tender and flavorful meat. Serve hot with your favorite sides and enjoy!
Notes
Please note that the nutritional information is a rough estimate and can vary significantly based on the products used in the recipe