Steak fajitas make a quick and easy meal perfect for weeknight dinner or on the weekends. Made with beef, peppers, onions and served with a stack of warm tortillas and condiments. They are always a favorite! My steak fajitas recipe is perfect for easy meal prep to make weeknight meals even easier! Tender, juicy, melt-in-your-mouth slices of steak with bell peppers and onion. Serve with tortillas, pico. It does not get any better. I have the perfect marinate for these steak fajitas.