london broil recipe

1 1/2 to 2 pounds flank steak or top round steak 1/4 cup olive oil 1/4 cup soy sauce 2 tablespoons Worcestershire sauce 2 tablespoons balsamic vinegar 2 tablespoons fresh lemon juice 2 cloves garlic, minced 1 tablespoon Dijon mustard 1 teaspoon dried oregano 1/2 teaspoon black pepper