In a blender, combine arribiatta sauce, beans, and water. Puree until smooth.
Transfer to pot, and heat on stove top until piping hot.
If using greens, place a handful at the bottom of the serving bowl, add hot soup on top.
If a more chunky soup is desired, leave 1/3 of beans out and combine them in to the mixture after blending.

1 25oz jar arribiatta sauce
1 14oz can great northern beans, drained
14oz water
Optional spinach or baby kale