INGREDIENTS
3 tbsp
red wine vinegar
1 tbsp
olive oil
2 tsp
dried oregano
2 tsp
minced garlic
1/4 tsp
black pepper freshly ground
1 1/2
pound(s) uncooked lean flank steak
3/4 tsp
table salt divided
1
large uncooked red onion(s) cut into 1/4-inch-thick slices
2
spray(s) cooking spray