Steak and pepper fajitas

Method

1. Heat the oven to 220°C/200°C fan/gas 7. Put the beef, peppers, onion, oil and fajita seasoning in a large bowl and toss everything until evenly coated in the spices and oil.
2. Lay 4 large strips of foil on a work surface, then divide the meat and peppers evenly among them. Fold up and tightly seal each strip to make 4 parcels. Put on a baking tray, then cook in the oven for 20 minutes.
3. Divide the tortillas into 2 stacks, then wrap each stack in a piece of foil. Warm in the oven for the final 4 minutes of the fajita cooking time. Transfer the tortilla and fajita parcels to a board and assemble, sprinkling with the grated cheese and fresh coriander. Serve with salsa, guacamole and soured
   cream on the side.