To  make  plain  ice  cream , they  add  ground - up  pods  from  an  ochid  plant  that  grows  in  Mexico  and  Madagascar.
The  plant  is  called  vanilla.
To make  chocolate  ice  cream , they  add  the  ground - up  beans  from  the cacao  tree  that  grows in Central and South America.

Click to see my picture of ice creams.

To make green pistacho ice cream, they add the ground-up kernal of the pistacho nut that grows on trees in Europe and Asia.
To make fruit ice cream, they add stawberries from a stawberry plant, 
or cherries from a cherry tree,
or bananas from a banana plant.