A combination of sizzling beef with onion and colorful peppers makes for a tantalizing, mouth-watering, multi-colored delight. Serve fajitas with a salsa albeit a tomato, mango, or sweet chili and, I also like to add some freshly chopped chilies, or fresh jalapenos to the mix when cooking, for an extra kick. For a variation, fajitas work just as well without the beef, try chicken, pork, or just vegetables.