Ripple Plate

 

Here's another piece, turned from timber out of the scrap pile. The plate is about 200mm in diameter.

 It has a bead, or step, around the rim, and another in from the rim, just before the ripples start.

Once again, this is stained pine, but this time it's untreated timber, so it could conceivably be used for food. The rippled surface would make eating from it inconvenient though.