Fry on Medium heat until golden brown.To make gravy heat butter in a pan,add cumin seeds,chopped onion,ginger slices,garlic cloves,2 dry Kashmiri red chillies,cashew nuts and tomatoes.Saute for a min. Add red chilli powder,salt,dhania powder,garam masala.Saute for a min.Add 200 ml water.cover and cook for 6_7 mins.