So I found this big old book about ancient cultures and in it, the typical offering on Crete was blood, wine and milk. Mixed together in a big bowl. The book describes the mix as a symbol for the drink of gods.
It's interesting because I heard that Maasai tribe uses (or used) blood and milk from their livestock as their main food source.
But does this have to do anything with Greek culture? Did ancient Greeks had a similar ritual? Could this be the nectar and ambrosia?