In a mixing bowl, combine balsamic vinegar, Worcestershire sauce, olive oil, Dijon mustard, garlic powder, salt, and pepper. Whisk until smooth. Place the sirloin steak in a ziplock bag and pour the marinade over it, ensuring it’s fully coated. Seal the bag and refrigerate for 30 minutes to enhance the flavors and tenderize the meat.

While the steak marinates, create a vibrant gremolata. In a small bowl, mix minced basil, chopped parsley, lemon zest, and a pinch of salt. Stir until well combined and set aside.

Preheat your grill or grill pan over medium-high heat. Brush the corn with olive oil and season it with salt and pepper to taste. Place the corn directly on the grill and cook for about 10 minutes, turning occasionally, until the kernels are tender and lightly charred. Remove the corn and let it cool slightly before cutting the kernels off the cob.

Remove the marinated steak from the fridge and let it come to room temperature for about 10 minutes. Preheat the grill to high heat. Grill the steak for 4-5 minutes per side, or until it reaches your desired doneness. The steak should have a nice char on the outside while remaining juicy inside.

Once grilled to perfection, remove the steak from the grill and transfer it to a cutting board. Allow it to rest for 5 minutes, which lets the juices redistribute.

In a bowl, combine ingredients for the balsamic vinaigrette. Whisk vigorously until emulsified.

In a large salad bowl, combine mixed spring greens, endive, cherry tomatoes, Gorgonzola cheese, corn kernels, and red onion. Toss gently until everything is well mixed. Drizzle half of the balsamic vinaigrette and half of the gremolata over the salad, tossing once more to ensure all ingredients are coated.

Top the salad with the sliced steak, drizzling the remaining gremolata and vinaigrette for extra flavor. Serve immediately.