Country-Style Pizza with Olives / Pizza Rustica con Olive | Ciao Italia

Ingredients

• DOUGH
• 1 1/2 pounds all-purpose potatoes, washed, peeled, and cut into 1-inch-thick pieces
• 2 cups reserved potato-cooking water
• 1 package active dry yeast
• 1/2 cup reserved mashed potatoes
• 1 teaspoon salt
• 1 teaspoon Filippo Berio olive oil
• 5 to 5 1/4 cups King Arthur™ Unbleached, All-Purpose Flour
• FILLING
• 2 tablespoons olive oil plus additional for greasing baking sheet and dough
• 2 bunches (ounces) scallions, washed and trimmed and cut into 1/4-inch slices
• 4 ounces (about 16) colossal Cerignola olives, pitted and chopped
• 1 cup Niçoise or Gaeta olives, pitted and chopped
• 1 tablespoon diced jalapeño pepper
• 1/4 teaspoon fine sea salt
• Grinding of black pepper
• 1 teaspoon dried oregano
• 1 egg, slightly beaten
• 1 tablespoon sesame seeds
• 2 tablespoons grated Pecorino cheese