The key to flavorful carne asada is giving the steak plenty of time to soak up all that citrusy, savory goodness. You’ll want to marinate the flank steak for at least 4 hours in the fridge, but overnight is even better if you’re prepping ahead. You can easily make the marinade the night before or the morning of your Date Nite—just pop it in the fridge and let the magic happen while you go about your day.