어서 넣다

prepare it, then put it in

Chains what you do to something with putting it in: 갈아서 넣다 "grind it and add it", 썰어서 넣다 "chop it and put it in", 짜서 넣다 "squeeze it in". Most of these lines are cooking, which is where the pattern lives, though it works for anything you insert — one is about adding subtitles to a video. The -어서 matters: the first action has to be done to the same thing you then put in.