Line a large baking tray with greaseproof paper.
In a large bowl, beat the butter, sugar and vanilla extract together until light and fluffy.
200 grams Unsalted butter, 100 grams White caster sugar, 1 teaspoon Vanilla extract
Add the flour and use your hands to bring the mixture together into a smooth shortbread biscuit dough.
300 grams Plain flour
Wrap the dough in clingfilm and place in the fridge for 30 minutes.
Lightly flour a worktop and rolling pin. Roll the dough out to roughly 0.5cm thickness.
Use a 10cm flower-shaped cookie cutter to stamp out the biscuits. Bring the scraps together and re-roll the dough to make 20 biscuits in total. Transfer the biscuits to lined baking trays. Use a small circular or flower cutter to stamp out the middle of 10 of the biscuits. Place in the fridge for 30 minutes (or the freezer if they fit for 10 minutes).
Meanwhile, preheat the oven to 160°C fan / 180°C conventional.
Bake for 14 minutes until lightly golden around the edges. Leave to cool on the baking tray.
Lay all the biscuits with the cut-out shape in the middle on a sheet of baking paper. Lightly dust with icing sugar.
2 tablespoons Icing sugar
Add a heaped teaspoon of jam/curd into the middle of the whole biscuits.
100-150 grams Jam or curd
Place the icing sugar-dusted biscuits on top and lightly press down to sandwich the two biscuits together. Serve and enjoy!