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- Mix the flour, bicarbonate of soda and salt in a bowl.
- Beat the butter, sugar and vanilla in a mixing bowl until soft and fluffy.
- Beat in the egg.
- Fold the dry ingredients into the wet ingredients and bring together until a dough forms.
- Knead the dough for 2 minutes on a floured surface until smooth.
- Shape the dough into a flat disc.
- Cover with clingfilm and chill for 30 minutes.
- Preheat the oven to 190 °C (374 °F).
- Cover 2 baking trays with baking sheet.
- Roll out the dough to 5 mm (0.20 in) thick.
- Cut out into 24 circles.
- Put the biscuits on 4 baking trays.
- Bake for 10-12 minutes until well cooked.
- Place the biscuits on a wire rack and leave to cool.
- Spoon 1 tablespoon of custard into one biscuit.
- Sandwich together with another biscuit.
- Repeat steps 15-16, using remaining biscuits and custard.
- In step 4, if the dough is too wet, add 1 tablespoon of plain flour and mix together.