Rahu and Ketu are the lunar nodes, points in the sky rather than physical planets, and are known in Jyotish as chhaya grahas, or shadow planets. They are traditionally linked with ambition, desire and restlessness (Rahu) and detachment, introspection and spiritual inclination (Ketu). Because they always sit opposite each other, their shanti is often performed together.
The puja usually includes Ganesh puja, sankalp, Navagraha invocation and focused worship of Rahu and Ketu, followed by their beej mantras. The Rahu mantra 'Om Bhraam Bhreem Bhraum Sah Rahave Namah' is commonly recited 18,000 times and the Ketu mantra 'Om Sraam Sreem Sraum Sah Ketave Namah' 17,000 times for a full anushthan, though shorter counts are frequently chosen.
Rahu is traditionally worshipped alongside Goddess Durga and Bhairav, and Ketu alongside Lord Ganesha. In Varanasi, where Kaal Bhairav is revered as the city's guardian, many families like to include a Bhairav darshan or prayer. Your Pandit will follow your family's tradition.