Microplane Premium Classic Zester
It turns a hard block of parmesan or a stubborn nub of nutmeg into a soft drift in seconds, and it takes the zest off a lemon without ever dragging up the bitter white pith. Nothing else in the drawer does one job this well.
Zesting citrus for cocktails and dressings, snowing parmesan over pasta, and grating garlic and ginger straight into the pan when I don't want to reach for a board. Rinse it the second you're done — dried-on zest is the only thing that dulls it.