Cioppino (Fisherman's Stew)

Bahan-bahan (4 porsi)

• ¼ cup + 2 tablespoons extra-virgin olive oil, (divided)
• 2/3 cup finely chopped shallots, (from about 3 shallots)
• 3 cloves garlic, (minced)
• 1 cup white wine
• 1 (28-oz) can crushed tomatoes
• 2 (8-oz) bottles clam juice
• 2 teaspoons sugar
• 1¾ teaspoons salt, (divided)
• ½ teaspoon crushed red pepper flakes
• ½ teaspoon dried oregano
• 7 sprigs fresh thyme, (plus 1 teaspoon fresh chopped thyme)
• 1½ lbs firm-fleshed fish fillets, (such as halibut, cod, salmon, snapper, etc., cut into 2-in (5-cm) pieces)
• 3 tablespoons unsalted butter
• 1½ lbs (about 18) littleneck clams, scrubbed (see note)
• 1½ lbs extra large raw shrimp, (peeled and deveined)
• Fresh chopped Italian parsley, (for garnish (optional))