This technique involves frying spices over a high temperature with a small amount of water added at regular intervals to stop them burning and sticking to the bottom of the pan too much. The spices will, however, adhere very slightly to the sides and bottom, and they need scraping down and stirring into the rest of the mixture. It is this scraping, stirring and mixing of the spices without letting them burn that creates the unique bhuna flavour.
Many Indian dishes can be made very simply in a large pan positioned over a heat source, which in many cases is a wood fire.