Combine the dry ingredients, then cut in the butter so that the mixture resembles breadcrumbs. Combine the water and vanilla and drizzle over the dry mixture. Blend until the dough can be packed together.

Roll out on a floured surface or between two sheets of waxed paper until the dough is about 3 mm (1/8 inch) thick.

Cut into circles or other shapes and bake on a greased baking sheet at 170 °C / 325 °F / Gas 3 for 20 to 25 minutes. Make sure the oven does not get too hot. They should not be too brown. Cool and store in an airtight container.