Break one medium size coconut and grate the complete coconut. Add freshly grated coconut and 1 cup of warm water in your grinder and blitz it for few seconds. Strain it through a thin muslin cloth to extract the coconut milk. The first lot will be thick milk and keep it aside in a separate container.
Now again add the squeezed coconut with 1 cup warm water in your grinder and bltiz it and extract extract the second cup of coconut milk and keep this separately.