Whilst preparing the meat, make salsa by mixing cucumber, tomato, cilantro, lime and pepper in a bowl and set aside.

To make fajita seasoning, in a large bowl, combine olive oil with cumin, garlic and pepper. Add beef strips to bowl and massage seasoning into the strips.

Heat a large non-skillet skillet or wok over medium heat. Add onion and red pepper and cook, stirring until tender. Remove from pan and set aside.

Increase heat to high and add beef. Cook, stirring for 4 to 5 minutes or until browned. Return vegetables to pan and stir for a further 1 minute.

Remove from heat and divide the beef into three portions.

Once the beef has cooked, place lettuce leaves on a serving plate and spoon one portion of the beef fajita mix inside topping with fresh salsa.

Fold romaine leaves and eat like a taco (be careful of spills!). Alternatively, shred lettuce leaves and enjoy as a salad.