Pistachio as filling, topping and finishing touch
The idea
Pistachio can be the main filling of a pastry or a small garnish on a finished sweet. These are different roles, and the photograph alone may not tell you which applies. A nut-filled pastry gives a different texture from a cheese dessert with pistachio only on top.
A practical next step
For a mixed dessert order, ask which items have nuts in the filling and which use them as a garnish.