This was better than I had even expected; it was fabulous! I made this exactly as posted, using champagne vinegar, 1/2 t. salt and 1/4 t. pepper. The dressing is really delicious, and I would suggest to make a lot in order to have it on hand. I couldn't find small white beans, so I had to use great northern. Again, adding the dressing to the tuna and bean mixture transformed it into a special salad. I could eat this without the green salad! I will definitely be making this again and making the dressing even more often! Thanks for sharing. Made for For Your Consideration Tag Game.