Put a sauté pan on a medium heat. Add the oil and, when it's hot, add the onion
Fry the onion for 10 minutes or until it is light brown, then add the garlic and ginger and fry for another 2 minutes
Add the chicken and brown for a couple of minutes before adding the tomatoes and green chillies. After a couple of minutes and the turmeric and a pinch of salt. Cook for 5 minutes stirring all the ingredients together
Fry for another couple of minutes and then add the chilli powder and garam masala. Cook for a minute or so and then crumble the fenugreek leaves into the pan
Mix in 360ml of hot water, or enough just to cover the chicken, and bring to a simmer. Cover and cook over a low heat for 20 mins, then serve