Steak fajitas

Ingredienser

• 300g/10½oz lean beef steak, such as sirloin or rump, visible fat trimmed and cut into thin strips
• 1½ tbsp extra virgin or sunflower oil
• 2 yellow peppers, deseeded and thinly sliced
• 2 red peppers, deseeded and thinly sliced
• 2 red onions, cut into thin wedges
• 1 tsp ground cumin
• 1 tsp ground coriander
• 1 tsp smoked paprika
• 400g tin red kidney beans, drained and rinsed
• 200g/7oz cherry tomatoes, halved
• 1 long red chilli, finely chopped, or ½ tsp dried chilli flakes
• 25g/1oz fresh coriander, chopped, plus extra to garnish
• lime wedges, for squeezing
• 4 x 40g/1½oz white or wholemeal flour tortillas, warmed, to serve
• 2 Little Gem lettuces, trimmed and shredded, to serve
• 6 tbsp natural yoghurt, to serve
• sea salt and freshly ground black pepper