Season your mince with salt and pepper. Add the parmesan and a tablespoon of oregano.
Roll the mince into meatballs and add them to the slow cooker.
Pour in the passata and add a teaspoon of sugar to offset the acidity in the tomato.
Sprinkle in a tablespoon of oregano.
Tear up the fresh basil leaves and scatter them in.
Put the lid on and cook for 3 hours on high or 7 hours on low.
Slice the baguette in half and sprinkle with mozzarella.
Place under the grill to melt the cheese.
Make your subs by adding the meatballs and drizzling the marinara sauce on top. Cut into portions.
Wrap each sub in greaseproof paper to bring on a picnic.