A quern is a single-square workshop used to grind certain plants into flour, sugar or dye. The process will also produce seeds from plants being milled. Unlike a millstone, the quern is powered by the dwarf using it to perform the labor. A quern must be crafted at the Mason's workshop from stone before it can be built as a workshop.
The quern may also be used to mill seeds/nuts to paste.
 How to
Command for building: b-w-q
- If all your rock nuts are in a stockpile, the paste-producing job will not be available. You must have at least one rock nut outside of a stockpile to initiate the job. Once the job has been initiated, the dwarf performing it can use a rock nut from the stockpile to actually perform the milling.