1) Combine balsamic, soy sauce, apple cider vinegar, garlic, salt, pepper, and olive oil and whisk vigorously.

2) Combine steak and marinade in a ziploc bag, press out excess air, seal.

3) Marinate 30 minutes or up to 2 hours. Use tongs to transfer steak to a preheated grill or cast iron pan over medium-high heat.

4) Cook for 6-8 minutes on each side til cooked to desired doneness. Rest for 10 minutes before slicing and serving.