Who needs Bake-Off?

Big argument chez Random the other day when we'd all gathered for a communal meal and it came to the dessert.  It was definitely a plum something, made with pastry but what? And I remembered my Mum telling me way back - a pie has a pastry top and bottom - a tart only has pastry on the bottom.  So I was able to definitively state that we were eating plum tart,  A quiche, by the way is a tart with an egg custard based filling.