This recipe for flank steak fajitas is a crowd-pleaser and perfect for a quick weeknight dinner. Using a food processor to make the marinade is a game-changer, as it allows you to quickly blend together all the ingredients. The marinade is made with lime juice, garlic, cumin, chili powder, and other spices, which infuse the steak with a ton of flavor. Once the steak is marinated, it's grilled to perfection and served with sautéed peppers and onions, guacamole, and sour cream. This dish is sure to become a family favorite!