Preheat your oven to 350°F (175°C). Line an 8x8 baking dish with parchment paper.

In a food processor, combine room temperature unsalted butter and granulated sugar. Process for about 2-3 minutes until pale and fluffy.

Add sifted all-purpose flour and a pinch of salt. Pulse until crumbly, then press into the prepared baking dish.

Bake for 12-15 minutes until lightly golden. Allow cooling.

In a mixing bowl, whisk together eggs and passion fruit purée until frothy. Gradually add granulated sugar and sifted flour until smooth.

Pour filling over the cooled crust and bake for 25-35 minutes until edges are firm.

Cool at room temperature for 1 hour, then refrigerate for at least 1 hour before cutting.