Preheat oven to Fan assisted130C/ 150C/ 300F/ Gas2.

Grease or line an 8x8-inch pan with parchment paper.

In the bowl of a stand mixer, beat together butter, sugar, salt, and vanilla until well-combined.

Stir in flour until just incorporated.

Press crust evenly into prepared pan.

Prick the crust with a fork all over the base.

Bake for 20-30 minutes, or until edges are golden brown and middle is light golden brown.

Remove crust from oven, and top hot crust with lemon curd.

Let it cool to room temperature.

Dust with powdered sugar.

This can be served at room temperature, or refrigerated and served cold.