Preheat the oven to 180oC, lay the aubergine slices on a tray, brush with a little oil and bake for 10-15 mins until soft.
Meanwhile, sauté the onion, garlic and pepper for about 3 minutes in some oil until starting to soften.
Add the rest of the ingredients, stir and bring to a boil then reduce and simmer for about 10 minutes.
Take your softened aubergine slices, roll some of the mixture into each one and place in a dish (this bit may get a bit messy and not be too accurate, but this doesn’t effect the overall deliciousness of the dish!!).
Pour any remaining sauce around the outside of the roll-ups, scatter the mozzarella on top and bake in the oven for around 20 mins until the cheese is starting to bubble and brown.