Grate the cassava pieces using a box grater (you want the side with the smallest holes). Alternatively, you can breakdown the cassava using a food processor instead (just make sure to chop your cassava very small). Make sure the consistency is fine, like a puree and lump free (you may need to add some water if using a processor).
Use a cheese or muslin cloth to squeeze out the excess liquid and discard the juice.
Place the cassava in a medium sized bowl and add your pink salt and work it into the entire batch of cassava using your hands to evenly distribute it.
Add about ¼ cup of water to re-hydrate your cassava pulp (it should be slightly wet, not bone dry).Use a pasty brush to lightly coat your skillet with oil.
Place your mould/ring on a skillet/tawa/crepe pan
Add some of the cassava pulp to your mould ( enough so it's about 1 inch in thickness) and use the back off a spoon to press and flatten the top (make sure the heat is off)
On low heat seal the first side (should take 2-3 minutes)
Remove the mould by lifting it, you may need to use a spoon to push down on the top as you lift.
Flip the bammy over to the other side (using an egg spatula).
Seal the other side then leave to cool on a cooling rack
Repeat the same process depending on the size of your bammy.
Once you have sealed your bammy if you do not intend to use it immediately it is very important to freeze it.