Karhai ginger chicken

2 tbsp vegetable oil

1 tsp cumin seeds

1 tsp garlic purée

1 tsp ginger, grated 

200g chicken breast cut into 5cm chunks

2 large tomatoes, finely chopped

1 tbsp tomato purée

2 tbsp plain yoghurt

½ tsp red chilli powder

½ tsp freshly ground black pepper

¼ tsp ground turmeric

salt, to taste

1 tbsp unsalted butter

For the garnish:

5cm piece ginger, peeled and cut into julienne

handful of coriander (cilantro) leaves, chopped

2 green chillies, finely chopped

10 mint leaves, chopped