This is a super simple steak marinade that I whipped together with limited ingredients. It turned out great and is one of my favourite ways to marinate steak.
1/2 cup balsamic vinegar
1/2 cup olive oil
1 tsp each of salt, onion powder, garlic powder
1/2 tsp pepper
An extra sprinkle of salt when cooking
In a glass dish whisk together all of the ingredients.
Place the steak in the dish with marinade and make sure it is covered on all sides.
Place in the fridge to marinade 4-12 hours before cooking.