Slit open your vanilla bean and scratch out with a butter knife the black seeds in the vanilla bean. Add the vanilla seeds to the mixing bowl and store the left over vanilla bean for another recipe, another time (we don't waste expensive ingredients!). Add the flour and water to the mixing bowl too and mix the whole content to a smooth dough. The dough shouldn't stick but should be able to form a whole dough without breaking apart. Wrap the dough into clean wrap and place into the fridge. Let cool for 1 hour.