Powered zester. Looks a little gimmicky at first, but zesting is actually really tedious, and it's difficult to evenly zest an orange, especially without mangling it a bit. But perhaps it's not the zesting that's most difficult, but the even turning.
This is analogous to using a bench motor vs. a handheld electric drill.
Previously:
Pomegranate de-seeding machine - GIF and video
Bell pepper de-corer de-seeder machine - GIF
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