Muffuletta Sandwich

Name: Muffuletta Sandwich
Ingredients: 1 cup each pitted green and black olives, coarsely chopped; 1 tablespoon tiny capers; 1/3 cup diced (1/4 inch) roasted red bell pepper; 1/4 cup diced (1/4 inch) celery, with leaves; 2 tablespoons chopped flat-leaf parsley; 2 teaspoons finely minced garlic; 2 tablespoons red-wine vinegar; 2 tablespoons olive oil; Salt and pepper, to taste; 1 round peasant bread (about 7 inches in diameter, 5 inches high), halved crosswise, insides pulled out; 4 ounces each thinly sliced Genoa salami and mortadella (found in the deli section); 4 ounces thinly sliced provolone cheese