Muffuletta Grilled Cheese Recipe

Name: Muffuletta Grilled Cheese Recipe
Ingredients: For the Olive Salad:; 3/4 cup pitted mixed oil-packed olives; 1 tablespoon capers; 1/4 cup chopped roasted red peppers; 2 tablespoons parsley leaves; 1/2 cup giardiniera (Italian-style pickled vegetable salad, see note); 1 medium garlic clove, minced (about 1 teaspoon); 1 tablespoon red wine vinegar; 3 tablespoons extra-virgin olive oil; For the Sandwich:; 2 tablespoons butter, cut into three even pieces; 2 slices hearty white bread, such as Pepperidge Farm or Arnold, or 2 slices hearty French or Italian bread; 2 slices mild Provolone cheese; 3 slices sweet soppressata; 3 slices mortadella; 3 slices hot capicola; Kosher salt