Basil Vinaigrette:
Add basil, water, vinegar, garlic, salt, and red pepper flakes to a blender. Blend for one minute until smooth. Slowly stream in all of the oil. Taste and adjust the seasoning with salt, if desired. Refrigerate until ready to use.
Steak:
Season steak with 2 tablespoons of basil vinaigrette, salt and black pepper. Cover steak and refrigerate for 2 hours.
Bring steak to room temperature 1 hour prior to cooking. Place steak on preheated grill, over medium-high heat and cook 4 minutes per side for medium rare (145°F) or longer depending on your preference. Transfer to a cutting board and let rest for 10 minutes. Carve steaks diagonally across the grain into thin slices.
Salad:
Arrange the spinach leaves on a large platter and top with the steak, strawberries, avocado, raw corn kernels, and blueberries. Season with salt and pepper. Toss with the vinaigrette and serve. Enjoy!