For the tomato sauce
- STEP 1
Heat the oil in a frying pan and add the onion, cook for 4-5 mins over a low heat, then stir in the garlic. Leave to cool completely.
- STEP 2
To make the tomato sauce, heat the oil in a saucepan and fry the onion, carrot and celery for 3-4 mins, then add the garlic and cook for a minute. Add the passata and bring to a simmer, then season and cook for 5 mins.
- STEP 3
Heat oven to 180C/160C fan/gas 4. Mix the cooled onion with the tomato purée, mince, egg and breadcrumbs, and season. Line a 900g loaf tin with a liner or baking parchment and pack in the meatloaf mixture. Cook for 20-25 mins or until a skewer poked into the centre feels roasting hot when pulled out. Leave to rest for 10 mins before lifting out of the tin.
- STEP 4
Serve slices of the meatloaf with some tomato sauce spooned over. Wrap any remaining meatloaf and use it as a sandwich filling for a lunchbox. Can be frozen for up to a month.