Steak fajitas marinade is a flavorful mixture of spices, herbs, and citrus juices that is used to marinate steak before grilling or pan-searing. The marinade helps to tenderize the meat and infuse it with delicious flavors. It typically includes ingredients like lime juice, garlic, cumin, chili powder, and soy sauce. Once the steak has marinated for a few hours, it can be cooked to perfection and served with tortillas, sautéed peppers and onions, and your favorite toppings.