- In a bowl, whisk together balsamic vinegar, olive oil, garlic powder, salt, and pepper.
- Marinate the flank steak in the balsamic mixture for at least 30 minutes.
- Preheat the grill to medium-high heat.
- Grill the steak for about 5-7 minutes on each side, or until desired doneness.
- Let the steak rest for 5 minutes before slicing it thinly.
- In a large bowl, combine mixed greens, cherry tomatoes, cucumber, and red onion.
- Top the salad with sliced steak and sprinkle with feta cheese if desired.
- Drizzle with any remaining balsamic marinade before serving.
Discover my list of kitchen tools I always use.