Slice the 1cm steaks into strips. Heat a large non-stick pan over a high heat with a drizzle of oil. Once hot, add the steak strips with a generous pinch of salt and fry for 2-3 min. Transfer the strips to a plate and reserve the pan (no need to wash it!).

Meanwhile, finely slice the peppers. Peel and finely slice the onion. 

Return the pan to a medium heat with another drizzle of oil. Fry the onion and peppers for 3-4 min until slightly softened. Add the fajita seasoning, smoked paprika, garlic powder a pinch of chipotle (spicy!). Fry for 2 min further. Season generously with salt and pepper. Add a splash of water if the spices are sticking to the pan.

Meanwhile, trim and separate the lettuce leaves. Slice the lime into wedges.

Return the beef strips and any beef liquid to the pan. Cook for 1 min.

Pick the coriander leaves. Fill the lettuce leaves with the onions, peppers, fajita steak and cheddar cheese. Serve with the sour cream, coriander leaves and lime wedges.