You need lactose for that, and coconut milk doesn't have any.
In a message dated 1/8/2002 8:00:34 PM Eastern Standard Time, [log in to unmask]
writes:
> I was wondering whether I could ferment coconut milk to create an
> alternative to sour cream? Has anyone tried this? I realize that some
> view
> fermentation as unpaleo, but I consider it a natural process.
>
> -Terry
>