Put your strawberries in a bowl. Sprinkle over 1 tablespoon of the sugar, the juice and zest of the orange and half the seeds from the vanilla pod. Mix it all together gently then put it to one side while you get everything else ready.
Mix the mascarpone and yoghurt with the remaining tablespoon of sugar and the remaining seeds from the vanilla pod. Stir it together really well.
Spoon the mascarpone on to each plate. Use the back of a spoon to make a well in the centre and then put the fruit on the top. Drizzle over the juices. Crumble half of the shortbread biscuit over each plate.