These easy marinated steak and avocado tacos are made with flavorful marinated flank easy steak, smashed avocado, pickled red onions, sliced jalepeño, cilantro, and thinly sliced radishes.
In a shallow dish or bowl whisk together the marinade ingredients and add the steak. Turn to coat and move to the refrigerator to marinate for at least an hour, up to four.
While steak is marinating, prep the toppings and make the pickled red onions. Mix the red wine vinegar, water and salt together together in a small bowl until salt is fully dissolved.
Add thinly sliced red onions, making sure they’re mostly submerged, and set aside. If they’re not fully submerged – don’t worry, just toss them in the pickling liquid every five minutes or so.