Cod with Sweet and Sour Pepper

Name: Cod with Sweet and Sour Pepper
Ingredients: 4 tablespoons olive oil, divided; 2 medium onions, cut into 3/8 in/1 cm slices (3 cups/350g.); 1 tablespoon coriander seed, slightly crushed; 2 ripe sweet bell peppers, 1 red and 1 yellow, halved lengthwise, seeded, and cut into strips 3/8 inch/1 cm wide (3 cups/320 grams); 2 garlic cloves, crushed; 3 bay leaves; 1 1⁄2 tablespoons curry powder; 3 tomatoes, chopped (2 cups/320 g); 2 1⁄2 tablespoons sugar; 5 tablespoons cider vinegar; 1 lb white fish fillet, divided into 4 equal pieces (500 g.); seasoned all-purpose flour, for dusting (I prefer Wondra to flour); 1⁄3 cup chopped fresh herbs (20 g); salt & pepper