Dinner Tonight: Muffaletta Sandwich

1 cup pitted olives, preferably a mix, roughly chopped

1 tablespoon minced shallots

1 tablespoon minced celery

1/2 cup roasted red pepper strips

3 tablespoons olive oil

1 tablespoon red wine vinegar

salt and pepper to taste

For the Sandwich

1 loaf focaccia, halved lengthwise, cut into quarters

4 ounces ham, salami, capicola, or a mix, thinly sliced

4 ounces mortadella, thinly sliced

4 ounces provolone cheese