An attachment for use with a food processing system includes a container body having a sidewall, a first end configured to be mounted to a food processing base, and a second end remote of said first end. The first end is open and the second end is at least partially open. A chamber is defined by said container body and an agitating member is receivable at the first end. A displacement member is arranged at the second end to seal the second end. The displacement member is extendable into the chamber from the second end to increase a pressure within the chamber.