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Heat 1 tbsp olive oil in a frying pan, add 1 chopped onion, then fry for 5-8 mins until lightly browned.
Stir in a 400g can chopped tomatoes, 1 heaped tsp light soft brown sugar, the leaves from a few sprigs of thyme and 1 tbsp soy sauce, then bring to the boil.
Simmer 5 mins, then slip 4 cod fillets into the sauce.
Cover and gently cook for 8-10 mins until the cod flakes easily. Serve with baked or steamed potatoes.