Pre-heat oven to 350 F.
Rub the peppers with a little olive oil and place them in a baking pan.
Roast the peppers, turning them every 15 minutes, until they are very soft, about 45 minutes.
When they are cool enough to handle, pull out and discard the stems and seeds.
Carefully scrape off the skin and cut the peppers into thin strips. Set aside.
In a small bowl, combine the raisins with the sherry and let the raisins soften for about 10 minutes.
In a medium bowl, whisk together 1/4 cup olive oil, vinegar, and mustard. Add the tomato, onion, olives, cilantro, jalapeno, and garlic and stir to combine.
Add the raisins and any of the sherry they have not absorbed to the mixing bowl.
Add the roasted pepper strips and toss well to coat them evenly.
Set aside to marinate in a covered container in the refrigerator for at least 2 hours, or up to 3 days.
Serve as a topping for bruschetta or crostini, or include as part of an hors d'oeuvre antipasto platter.