Speedy chicken couscous

Name: Speedy chicken couscous
Ingredients: 1 tsp finely chopped fresh coriander; 2 tsp chilli powder; 1 tbsp tomato purée; 1 tbsp soy sauce; salt and freshly ground black pepper; 2 tsp olive oil; 200g/7oz chicken thigh fillets, cut into bite-sized pieces; 150g/5oz broccoli, roughly chopped; 1 red pepper, deseeded and thinly sliced; 1 green pepper, deseeded and thinly sliced; 4 spring onions, roughly chopped; 200ml/7fl oz boiling water; 150g/5oz couscous; ½ lime, zest and juice; 2 tsp finely chopped coriander