Matalotta-Style Mixed Fish Stew - Lidia

Ingredients

• 1 pound skinless grouper fillet, cut into 2-inch chunks
• Kosher salt
• All-purpose flour, for dredging
• 1/4 cup extra-virgin olive oil, plus more for drizzling
• 1 medium onion, chopped
• 3 stalks celery, chopped
• 2 fresh bay leaves
• 1 cup dry white wine
• 1/4 cup pitted large green olives, such as Cerignola, halved
• 3 tablespoons drained capers in brine
• One 28-ounce can whole San Marzano tomatoes, crushed by hand
• Peperoncino flakes
• 12 littleneck or other small clams
• 8 ounces large shrimp, peeled and deveined