Cut into portions and serve if possible after leaving at room temperature for around 30 minutes.
Remarks
The true St Tropez tart recipe is a closely guarded secret and patented, so the details are not known. We can only attempt to get close to it, as I have done in this version.
Apparently it was Brigitte Bardot who, during the filming of And God Created Woman, suggested the name "Tarte de St Tropez", but the pâtissier himself preferred "Tarte Tropézienne". [Translator's note: a not-so-subtle difference in French which is entirely lost in translation.].