I found this recipe offline but be sure to check to make sure you can eat the other things inside it, I had to double check since I kept forgetting. :)

It is amazing at best and I have had three friends ask about it since we had a dinner party over the weekend I wanted to share.

(makes 6 servings)

1 large French baguette, about 1 pound (480 g) 
4 medium tomatoes, about 1 1/4 pounds (600 g) total, peeled, and chopped
4 scallions, white part and 8 inch (2.5 cm) green, finely chopped
1 medium green bell pepper, seeded and chopped
1 6-ounce (195 g) can water-packed tuna, drained and flaked
1 tablespoon (15 ml) capers, drained (optional) 
dressing
3 tablespoons (15 ml) red wine vinegar
2 tablespoons (30 ml) olive oil
1 teaspoon (5 ml) Dijon mustard
1 clove garlic, minced
2 tablespoons (30 ml) chopped flat-leaf parsley
1 tablespoon (15 ml) chopped fresh mint or 1 teaspoon (5 ml) crushed dried
1 teaspoon (5 ml) fresh thyme leaves or 1/4 teaspoon (1.25 ml) crushed dried

1.Cut the baguette in half lengthwise and scoop out some of the bread to create a shell. Set crumbs aside.
2.In a large bowl, combine tomatoes, scallions, bell pepper, tuna, capers (if using), and reserved bread crumbs.
3.In a small bowl, whisk together dressing ingredients. Drizzle over tuna mixture and toss to mix thoroughly. Mound the mixture into the bottom half of the bread, packing down firmly. Top with other half of the bread. Press bread halves together and tightly wrap in plastic wrap or aluminum foil. Refrigerate for at least several hours or overnight.
4.Transport the bread, still wrapped, to the picnic site. Transfer to a slicing board and cut into 6 portions.

I had this bread at a Christmas Party this year.  My best friend made it and brought the ingredients list because she wanted to be sure I could have it.  It was delicious.