What is it?  If you said this was a DUCK PRESS, you were correct:

A duck press is an innocuous-enough sounding name for a kitchen tool that actually has a rather macabre use.

Pressed duck is a famous dish in French cuisine and it uses, what else — a duck press for its creation. The dish begins innocently enough, with a roasted duck, with the legs removed and grilled. Thin slices are cut from the duck breast and those slices and the legs are returned to a reduction of red wine on a hot plate or in a chafing dish. The entire remaining carcass is then placed into the duck press.

A duck press, incidentally, is usually made of brass or another heavy-weight metal. It stands about 20 inches (51 centimeters) tall and weighs somewhere around 25 pounds (11.3 kilograms). The press has a heavy disc attached to a turning screw, which ratchets the disc down into a container. The truly macabre ones stand on brass webbed duck feet.

After the duck carcass is placed inside the duck press, the waiter screws the metal disc down, down, down, pressing the carcass flat, in order to extract all the remaining juices and marrow. When this gruesome task has been accomplished, the waiter adds those juices to the wine reduction, along with a little brandy or cognac, and some butter. The resulting sauce and duck breast slices are then presented to the diner, along with the duck legs, with perhaps a shaving or two of truffle.