A fire puja is a Vajrayana offering ritual to a tantric deity.
There are four types of fire pujas corresponding to the four activities: pacifying, increasing, magnetizing, subjugating.
Many substances (such as oil or butter, torma, fresh wood sticks, sesame seeds, rice, mustard seed, barley, lentils, wheat, beans, honey kusha grass, flowers) are burned in the fire for the benefit of all beings. A small portion of the substances are offered to the fire god.
A fire puja is often performed after an empowerment or completion of a retreat.