Preheat the oven to 200C/180C Fan/Gas 6 ... Once melted add the spinach and cook for a minute or so until wilted. Serve the cod hot, drizzled with a little balsamic vinegar, on a bed of wilted ...
Serve with the salad leaves or greens. The frozen cod can be swapped for any other firm white fish. If you are using fresh cod, reduce the oven cooking time to 10–12 minutes.