The plunger is only to be used to push food onto the blades,or to release
the air bubble when blending heavy liquids. It is not supposed to be left
in when blending as it interferes with the vortex . The vortex pulls food
down onto the blades and pushes it back up in a continuous cycle making a
more efficient blend. If your going to use the vitamix,then use it properly
. Nice soup though.