Tomato and onion baked fish

Ingredients (4 servings): 1/3 cup olive oil 1kg brown onions, halved, thickly sliced 700g bottle tomato passata (see passata recipe) 1 tablespoon caster sugar 4 x 150g skinless firm white fish fillets (Hake) Steamed Basmati or Brown rice, green beans and small fresh basil leaves, to serve   Method: Heat ¼ cup oil in a large saucepan…