Rigatoni with Cauliflower, Saffron, and Golden Raisins - Lidia

Ingredients

• 1 1/2 teaspoon kosher salt, plus more for the pot
• ½ cup golden raisins
• ½ teaspoon saffron threads
• One 4-inch-long chunk day-old bread, crust removed
• 6 tablespoons extra-virgin olive oil
• 1 medium onion, sliced
• 1 small head cauliflower, cut into small florets, plus the tender leaves, chopped
• ¼ teaspoon crushed red pepper flakes
• 1 tablepsoon tomato paste
• ½ cup dry white wine
• 1 pound rigatoni
• ¼ cup chopped fresh Italian parsley
• ¼ cup pine nuts, toasted
• ½ cup freshly grated Pecorino Romano