These tools-suribachi（すり鉢）& surikogi （すりこぎ）are used to grind sesame seeds.
And I can use ground sesame seeds for a dish like this.
I bought suribachi (the porcelain bowl) and surikogi (the wooden bar)at 100yen shop.
By the way, “grinding sesame seeds”「ごまをする」 these words also describes a person who sucks up. Same as “apple polish” or “butter up”.