Fresh and attractive. I actually made this some time ago when we had guests, and forgot to post a review. I did cook the beans for less than 6 mins as I suggested in my ill-conceived first comments. As I have it available, I used fresh thyme, basil and oregano, finely chopped. Instead of the vinegar I used lemon juice. Original and refreshing. Oh yes: I doubled the recipe to use with French bread as a lunch for the guests.
Tuna, beans & peppers work well together as a combination of flavors. The dressing is just heavenly. I made up a double batch, so I can use it again on other salads.