Dhanvantari Havan is a Hindu ritual that involves offering prayers and performing a fire ceremony to Lord Dhanvantari, who is considered to be the god of Ayurveda or the ancient Indian system of medicine.

To perform the Dhanvantari Havan, one needs to follow certain steps:

1. Select a suitable date and time for the Havan, preferably during an auspicious occasion.
2. Create a sacred space or altar for the Havan, which should be clean and decorated with flowers and other offerings.
3. Light the sacred fire using a mixture of ghee, camphor, and other herbs.
4. Chant mantras and offer prayers to Lord Dhanvantari while performing the Havan.
5. Offer various items such as fruits, sweets, and other offerings to the fire, while reciting specific mantras and invocations.
6. Finally, seek the blessings of Lord Dhanvantari and conclude the Havan by performing aarti or waving a lamp in front of the deity.

The Dhanvantari Havan is believed to promote good health, well-being, and prosperity. It is often performed by people who are seeking relief from illnesses or want to maintain good health.