- STEP 1
For the meatballs, place one tablespoon of the oil into a pan over a medium heat. Add the onions and fry for 2-3 minutes, until soft.
- STEP 2
Add the oregano, celery salt and cumin and stir well. Remove from the heat and allow to cool.
- STEP 3
Place the mince into a large bowl. Add the cooked spiced onions, egg yolk, flour and mustard.
- STEP 4
Mix together well with floured hands and season with salt and freshly ground black pepper.
- STEP 5
Dust a chopping board with flour. Roll the mince mixture into small walnut-sized balls.
- STEP 6
Heat another tablespoon of oil in a large pan. Add the meatballs and fry over a moderate heat for five minutes, turning over to brown evenly.
- STEP 7
Carefully cut open one meatball to check they are cooked through - the meat should be brown, not pink, all the way to the middle.
- STEP 8
Remove the meatballs from the pan, place onto a serving dish and keep warm.
- STEP 9
To make the tomato sauce, heat the olive oil in a saucepan over a low heat. Add the crushed garlic and fry for 1 minute to soften.
- STEP 10
Add the passata into the saucepan, increase the heat and bring to boil. Season, to taste, with salt and freshly ground black pepper.
- STEP 11
To serve, spoon the sauce over the meatballs and finish with grated cheese of your choice.