noun
removing scum; skimming off scum
Refers to the act of removing scum or foam that rises to the surface when simmering broth, stock, or stews. Also used for the utensil (a fine-mesh skimmer) used for this purpose.
See also: アク
煮物を作るときは、最初にアク取りをしっかり行う。
When making simmered dishes, first remove the scum thoroughly.
このアク取りは細かい網で
This skimmer has a fine mesh and can cleanly scoop the scum from the broth.
アク is the scum itself; アク取り is the action of removing it or the tool used.
Compound of アク (scum, from 灰汁) and 取り (taking, removing), the nominalized form of 取る (to take).