Chop the onion, garlic, ginger and chillies together in a food processor. Heat the oil in a large frying pan and fry the mixture until it becomes very fragrant. Add the mince and fry until it begins to brown, stirring to break up any lumps.
Add the spices and fry for 1 min. Add the tomatoes and bring to a simmer, cook for 1 min, then stir in the yogurt, some salt and a good grind of black pepper. Add a splash of water if you need to, then cook the mixture for 30 mins. Add peas and cook for 5mins

Then stir in the coriander. Serve with Indian breads or poppadums, chutney and some more yogurt.