Open all bean cans separately, rinse and drain, and deposit into serving bowl. Add spices. Cut onion wedge perpendicular to the grain of the wedge to create the thinest possible slices that make half moon shapes. Separate the half moon "rings" and add dressing. Mix well. Cover and let rest under refrigeration for 24 hrs, stirring every six hours to ensure flavors meld well. Return contents of bowl to room tempertaure to ensure olive oil in dressing has liquified, and stir again. Taste and add additional salt/pepper to taste.