I'm glad someone put this on the site. We've been making this for years and we love it. I do try to find whole wheat baguettes, if I can. And I pretty much always use red or orange peppers in place of green. I've even done this without the tuna, substituting cheese for non-meat eating friends.
I did not really like this but I know it is a taste thing. I don't really like tuna unless it's swimming in mayo. The tuna flavor was very pronounced in this sandwich.
This is a great sandwich. The only change I've made is to sub a red pepper for green and I added some butter lettuce. Both my husband and I love this!