30 g (1 oz) butter
1 small onion, finely chopped
- Preheat the oven to 200°C (400°F/Gas 6). Lightly grease a baking tray.
- Melt the butter in a small frying pan and cook the onion over low heat for 5 minutes, or until soft but not brown. Combine the onion, tuna, capers, parsley and parm