The Creator and the creation are one. Ardhanareeshwar form is an amalgam of Shiva and Shakti together. This form reminds us that Lord Shiva is beyond gender, this form represents the un-manifest and the manifest; Shiva the formless and Shakti the formed; Shiva consciousness and Shakti energy, not only in the cosmos as a whole but in each and every individual. Ardhanarishwara form also shows how the feminine principle of Shakti is inseparable from the male principle of Shiva.
Therefore, worshipping Lord Shiva and Shakti in the form of Ardhanareeshwar is considered to be the best offering as it is dedicated to both the male and female energies of the Parabrahma. One should worship this form of the divine couple for spiritual upliftment and fulfillment of desires, to cleanse all past sins and bad Karmas, for good marital relation between partners and for peace and harmony in the family.
Puja Description: Swasti Vaachan, Shanti Path, Sankalp, Gauri-Ganesh Pujan, Kalash Pujan, Ardhnareeshwar Sthapan, Bilwa Archan, Recitation of Ardhnarishwar Stotram Paath then Aarti, Prasad to Brahmins