Instructions

1. 1
   Combine the flour, bicarbonate of soda, and salt in a bowl.
2. 2
   Beat the butter, sugar and vanilla in a mixing bowl until soft and fluffy.
3. 3
   Beat in the egg.
4. 4
   Fold the dry ingredients into the wet ingredients, and bring together until a dough forms.
5. 5
   Knead the dough for 2 minutes on a floured surface until smooth.
6. 6
   Shape the dough into a flat disc. Cover with clingfilm and chill for 30 minutes.
7. 7
   Preheat the oven to .
8. 8
   Line 2 baking trays with parchment paper.
9. 9
   Roll out the dough to thick.
10. 10
    Cut out into 24 circles with a cookie cutter.
11. 11
    Transfer the biscuits to the prepared baking trays.
12. 12
    Bake for 10–12 minutes until well-cooked.
13. 13
    Place the biscuits on a wire rack and leave to cool completely.
14. 14
    Spoon 1 tablespoon of custard onto one biscuit. Sandwich it together with another biscuit.
15. 15
    Repeat the biscuit assembly, using remaining biscuits and custard.
16. 16
    Enjoy!