Most commonly, it is bought as whole dried seeds and ground as and when needed, but it can also be found as a ready made powder. To make coriander powder at home, roast it slightly without oil to enhance the aroma and then grind in an electric grinder or with a mortar and pestle. Coriander powder is derived from the seeds of the coriander plant. It adds a mild flavour and aroma to sweet and savoury food preparations. Most commonly, it is bought as whole dried seeds and ground as and when needed, but it can also be found as a ready made powder. Coriander powder is derived from the seeds of the coriander plant. It adds a mild flavour and aroma to sweet and savoury food preparations. Most commonly, it is bought as whole dried seeds and ground as and when needed, but it can also be found as a ready made powder. It is commonly pronounce as Dhaniya powder.