ksiptva ksirodadhau sarva
manthanam mandaram krtva
netram krtva tu vasukim
sahayena maya deva
daitya yuyam phala-grahah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O demigods, cast into the Ocean of Milk all kinds of vegetables, grass, creepers and drugs. Then, with My help, making Mandara Mountain the churning rod and Vasuki the rope for churning, churn the Ocean of Milk with undiverted attention. Thus the demons will be engaged in labor, but you, the demigods, will gain the actual result, the nectar produced from the ocean.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
It appears that when different kinds of drugs, creepers, grass and vegetables are put into this milk and the milk is churned, as milk is churned for butter, the active principles of the vegetables and drugs mix with the milk, and the result is nectar.