A mouli grater is a hand-operated cooking tool designed for grating or pureeing small quantities of food. The device consists of a small metal drum with holes that grate the food and a handle for turning the drum.
The hand-held unit consists of two sections with hinged handles. The end of one handle contains a food hopper with a grating cylinder and a crank for rotating the cylinder. The other section has a rounded surface that acts as a clamp, pressing the food to be grated into the grating cylinder. The hinged handles are held in one hand and squeezed so that the food presses against the grating cylinder. Meanwhile, the other hand turns the crank, causing the cylinder to rotate and the food to be grated.
Mouli is either a French or Italian brand name for this kind of spring-loaded sieve.