Muffaletta

Name: Muffaletta
Ingredients: 1/2 cup (113g) cool water; 1 cup (120g) King Arthur Unbleached All-Purpo; 1/8 teaspoon instant yeast; All of the starter; 3 1/2 cups (418g) King Arthur Unbleached All-; 1 cup (227g) lukewarm water; 1 1/2 teaspoons (9g) salt; 1/4 teaspoon instant yeast; olive oil or garlic oil; 2 cups (340g) chopped green and black olives; 8 ounces (227g) sliced ham; 8 ounces (227g) sliced Genoa salami; 8 ounces (227g) sliced provolone cheese; 8 ounces (227g) sliced mortadella; 1 large egg white beaten with 2 tablespoons (28g) water; sesame seeds optional