Here is part 1 of making double-walled bowls, with instructions. Part 2 will be trimming the piece right side up.
Remember that you are throwing “upside down” – the “rim” of the outside wall is actually the foot of the finished piece!
Center the clay and open all the way to the bottom. However far out you pull the donut of clay will be the diameter of the finished bowl part. Flatten the top of the donut to make splitting it (next step) easier. Clean up the inside of the bowl with a rib or sponge.