I'm marinating flank steak for fajitas ( I wanted skirt steaks but they were out!) and I am using a soy sauce, vinegar, water marinade. I heard that flank steaks can get mushy if marinating for too long in anything vinegar based. Do you think it would be okay to marinate overnight, or I should I do it tomorrow morning? Or even later? Dinner is at 6:00.
Thanks in advance.