Peri peri chicken pitta with sweet potato wedges

Name: Peri peri chicken pitta with sweet potato wedges
Cook time: 30 min
Total time: 30 min
Cuisine: American, Mexican, Latin American
Ingredients: 1 lemon; 2 red onions; 1 tomato; 1 mini gem lettuce; 2 garlic cloves; 8ml soy sauce; 1 tsp smoked paprika; 1 tsp dried oregano; ½ tsp dried chilli flakes; 1 sweet potato; 80g natural yoghurt; 2 British chicken breast portions; 2 wholemeal pittas