Micro puree machines have a locking assembly for locking a container to a coupling on the machine, preventing the container from rotating out of the coupling during processing. The locking assembly includes at least one protrusion on the container configured to slidably engage a slot on an interior surface of the coupling when the container is rotated in a clockwise direction. The coupling has a clip that is moveable from a first position, in which the clip prevents rotation of the container in the counterclockwise direction, to a second position, in which the clip allows rotation of the container in the counterclockwise direction. The clip is spring biased toward the second position. Pressing a button on the coupling moves the clip from the first to the second position.