het hele eiereneten

Literally, “the whole egg-eating”. This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

het hele eiereneten n (uncountable)

1. (idiomatic) everything, the whole thing, all there is to it (especially when emphasizing that something is less daunting or complex than assumed)

   Het is eigenlijk een heel simpele procedure: deze drie stappen zijn het hele eiereneten. ― It's actually a really simple process: these three steps are all there is to it.