Put the beef in a shallow bowl and add the peppers, onion, garlic, fajitas or Mexican seasoning, half the lime juice and oil.
Heat a large non-stick frying pan and cook the beef mixture for 3-4 mins or until the beef and vegetables caramelise.
Meanwhile, warm the tortillas in a hot oven.
To prepare the sweetcorn salsa, mix all the ingredients together, season to taste and set aside.
To assemble the fajitas, put some salsa on the base of each tortilla, then the beef and vegetable mix. Sprinkle over the herbs.
Serve with the sweetcorn salsa and accompaniments of your choice.