Tear two slices of the bread and drop the pieces into the container of an electric blender. Cover and blend on high speed for six seconds. Empty into a bowl. Repeat with remaining bread.
Place half of the apples, onions and celery in the blender. Fill the blender container with cold water to within one inch of the top; cover. Blend on high speed for four seconds. Drain, and empty the chopped ingredients into the crumbs. Repeat with remaining apples, onions and celery.
Place the butter, seasonings and prunes in the blender. Cover and blend on high speed for fifteen seconds. Empty into the crumbs and mix lightly.