Samudra manthan
The "Mahabharata" (Adi Parva book) records that Kamadhenu-Surabhi rose from the churning of the cosmic ocean ("Samudra manthan") by the gods and demons to acquire "Amrita" (ambrosia, elixir of life). As such, she is regarded the offspring of the gods and demons, created when they churned the cosmic milk ocean and then given to the Saptarishi, the seven great seers. She was ordered by the creator-god Brahma to give milk, and supply it and "ghee" ("clarified butter") for ritual fire-sacrifices.