Preheat the oven to 180°C . 

Take the butter out of the fridge to allow it to soften. 

1. Weigh all of the dry ingredients into a large mixing bowl: flour, Zùsto, vanilla powder, salt.
2. Mix all the dry ingredients together.
3. Weigh the butter and separate the egg. 
4. Beat the yolk with 1 tablespoon of water.
5. Add the diced butter to the dry ingredients.
6. Knead the dough well with your hands.
7. Add the yolk and water to the dough.
8. Knead the dough with your hands into a firm ball.
   • The heat from your hands will melt the butter, giving the dough its shape.
9. Wrap the dough in clingfilm and put it in the fridge for 25 minutes
   • If the dough goes into the oven cold, the cookies won’t turn out as hard and will have a crispness to them. 
10. Remove the dough from the foil and flour your work surface.
11. To shape the cookies, you can use a cookie cutter or make a cylinder out of the dough and then cut it into 0.5 cm slices. When cutting out the dough, make sure you roll out the dough to a thickness of 0.5cm. 
12. Place the cookies on the baking sheet with 3 cm between each cookie.
13. Bake the cookies until golden brown for 13-15 minutes.