Once the corn is collected, the grains are separated from the straw then beaten and winnowed. Traditionally, winnowing was done with large wicker baskets which one shook so that the lightest particles flew away. After the sifting and crushing, one still needs to filter the flour.
It is through these tiresome stages that one manages to obtain a flour as tasty as the . Other know-hows, quite as traditional, provide flours such as the , the or the .