Grilled Flank Steak, Portobello and Green Bean Salad

Combine 2 tablespoons olive oil, 3 tablespoons balsamic vinegar, orange juice, 2 teaspoons minced garlic, chili flakes, and 1/4 teaspoon each salt and pepper in a bowl and whisk. Place steak and mushrooms in a glass baking dish or sealable ...