Steak fajita skewers

Serves 6
800g sirloin steak, cut into cubes
1 tbsp cumin
1 tbsp chilli powder
1 tbsp garlic powder
Salt and black pepper
2 green peppers, cut into cubes
2 red peppers, cut into cubes
1 large white onion, cut into cubes
8-10 skewers, soaked in water for 20 minutes if wooden
  1. Preheat a barbecue or griddle pan to a medium-high heat. 
  2. Combine the steak, cumin, chili powder, garlic powder, salt, and pepper in a bowl, mixing until the cubes of steak are evenly coated.  
  3. Slide a piece of steak down one of the skewers, followed by pieces of green pepper, red pepper, and onion. Repeat until there is only a 3cm gap on the top of the skewer. 
  4. Repeat with the remaining skewers. 
  5. Grease the surface of the barbecue or griddle pan by rubbing with a tongs and some oiled kitchen paper. 
  6. Cook the skewers for about 10-15 minutes with the lid closed, flipping them halfway.