Put the sesame seeds in a bowl and wash them thoroughly in cold water.
Rinse using a thin colander and dry using a paper towel.
Roast the sesame seeds in a preheated skillet or pan in low heat.
Stir continuously with a wooden spoon and shake the skillet occasionally so the sesame seeds don't burn.
When seeds start popping, try crushing one between your thumb and ring finger. If the seeds crack easily, they are done; if not, roast for a bit longer.
When the seeds are done, remove them from the pan and put them on a plate or bowl to cool.
Measure the salt and roast in the skillet for a few minutes, stirring continuously. This will evaporate moisture from the salt, making it easier to combine with sesame seed oil.
Grind the salt first in the suribache until it is very fine.
Add the sesame seeds and grind the two together.
When using the suribachi, don't stir too fast or apply too much pressure, or it will turn into a paste.
Stir in horizontal circles in a spiral movement
Crush about 80 per cent of the seeds.