1 cup green olives, preferably Italian, pitted and chopped 
1 cup chopped sun-dried tomatoes (packed in olive oil,
drained) 
1 1/2 tablespoons capers 
3 cloves garlic, finely chopped 
1 tablespoon chopped, fresh oregano (1 teaspoon dried) 
1/2 teaspoon freshly ground black pepper 
2 tablespoons balsamic vinegar or other red wine vinegar 
2 tablespoons olive oil 
1 large round loaf Italian bread, about 7 inches in diameter

1 sweet onion, thinly sliced, separated into rings 
1/4 pound thinly sliced mozzarella 
1/4 pound thinly sliced salami 
1/4 pound thinly sliced ham 
1/4 pound thinly sliced provolone 
1/4 pound thinly sliced Mortadella