Mediterranean Beef Gratin

* This recipe makes two gratins

1. Preheat the oven to 190°C/gas mark 5.
2. Heat the oil in a large frying pan set over a medium heat. Add the onion, pepper, courgette and garlic and sweat gently for 3 to 4 minutes, until the vegetables have softened. Add the beef and allow it to brown a little before adding the tomatoes, stock and Worcestershire sauce, if using. Bring to the boil, then reduce the heat and simmer for 6 to 7 minutes.
3. To make the topping, mix everything together until well combined.
4. Divide the beef mixture evenly between 2 gratin dishes and sprinkle over the topping. Wrap one of the gratins in cling film, label and date and pop it in the freezer. Defrost thoroughly before cooking at a later date.
5. To cook the remaining gratin, place the dish onto a flat baking tray and pop it into the oven for 20 to 25 minutes, until it’s bubbling and piping hot.