Stir together the marinade ingredients in a shallow bowl or gallon zip lock bag. Add the steak and toss to coat. Cover and marinade for 8 hours or overnight.
Preheat your grill or grill pan to medium-high heat (I grilled at 450° on my Traeger). Place the steak on your preheated grill and cook for 5 minutes. Flip the and grill for another 3-5 minutes or until cooked to your liking.
Remove the steak from the grill and set aside to rest while you prepare the remaining ingredients.
Make a batch of basil vinaigrette if using.
Slice the rested steak, then assemble your salads with lettuce, arugula, sliced steak, tomatoes, avocado, onion, cucumber, and crumbled bleu or feta cheese. Drizzle with dressing and serve!