Broccoli Rabe, Potato and Rosemary Pizza

INGREDIENTS

• Salt
• 2 uncooked pizza crusts (recipe below)
• 3 1/2 cups all-purpose flour
• 1/2 cup lukewarm water
• 8 ounces fresh mozzarella cheese, thinly sliced
• 1/4 cup olive oil
• 2 tablespoons fresh rosemary leaves
• 1/2 pound broccoli rabe, washed, ends trimmed
• 1 large yukon gold potato, very thinly sliced
• 1/4 cup semolina flour
• Freshly ground black pepper
• 3/4 cups cold water
• Rosemary sprigs for garnish
• 1 large garlic clove, minced, plus 2 garlic cloves lightly smashed but still intact
• 1/2 cup finely grated Pecorino Romano cheese
• Extra-virgin olive oil
• 2 teaspoons dry yeast
• 1/4 teaspoon crushed red pepper flakes
• 1 teaspoon salt