It is a potato ricer. You place boiled potatoes in the basket and push the lever down to squeeze the potato through the holes. They are very handy for making very smooth mashed potatoes, though they can be tricky to clean - washing them immediately or at least putting them in water so the potato doesn't harden is advised.

It is a potato ricer. You place boiled potatoes in the basket and push the lever down to squeeze the potato through the holes. They are handy for making very smooth mashed potatoes, though they can be tricky to clean - washing them immediately or at least putting them in water so the potato doesn't harden is advised.