Do

1. Preheat oven to 160°C and line two baking trays with paper.

2. Place sugar, rice and salt into Thermomix bowl and mill 10 sec/speed 10. Open lid slowly as there is a lot of residual dust.

3. Add vanilla and butter and chop 6 sec/speed 6.

4. Add flour and egg yolk and blend 6 sec/speed 6.

5. Tip mixture out onto a floured mat and roll into a sausage shape.

6. Chill for 10 minutes. Cut into rounds and either use a cookie press for a design or just bake as discs, on prepared trays, exactly 14 minutes.

7. Cool before storing in airtight containers until use.