Combine the ingredients together and knead well until smooth. Divide the dough into 2 pieces, form into a ball and wrap each with plastic wrap. Chill overnight.

Line 2 baking sheets with parchment paper. On a clean working surface cut each ball with a knife into 6 pieces to facilitate the kneading, as the dough will be hard. Knead each piece of dough and roll it into a 2 cm rope in diameter. Cut 2 cm pieces and form each into a ball.

Preheat oven (180°C). Bake on second lower rack for about 20 minutes until golden brown on the top. Sprinkle warm cookies with confectioners’ sugar. Let cool. Keep in a tin can.