Heat oven to 200C/180C fan/gas 6. Put the aubergines on a baking tray and make a slit down the centre of each. Drizzle with 2 tbsp olive oil and season. Bake for 50-55 mins or until the flesh is soft. Heat the grill. Tip the tomatoes into a bowl and season well. Fill the aubergines with layers of tomatoes and mozzarella, and finish with the Parmesan. Put under the grill for 5-7 mins until the cheese is golden.