Step 1

Preheat the oven to 200C/400F/Gas 6.

Step 2

Heat a saucepan over a medium heat. Add one tablespoon of the olive oil and, once hot, add the onion and a pinch of salt. Fry the onion for 4-5 minutes, or until softened. Add the garlic and continue to cook for two minutes.

Step 3

Pour in the tomatoes and mix well, breaking up any larger bits with the back of your spoon. Season with a pinch of salt and pepper and bring to a simmer. Reduce the heat and simmer gently for 20-30 minutes, or until the tomato sauce is thickened and flavoursome.

Step 4

Meanwhile slice the aubergines lengthways into slices 5mm/¼in thick. Brush the aubergine slices with olive oil and season well with salt and pepper on both sides. Heat a griddle pan until smoking hot and then griddle in batches for 2-3 minutes on each side, or until all the slices are golden brown. Alternatively, heat the grill to high, place half of the aubergine slices on a baking tray and grill for 3-4 minutes on each side. Continue with the rest of the slices until they are all golden-brown. Remove and leave to one side once cooked.

Step 5

Add a spoonful of tomato sauce to the bottom of a medium sized ovenproof baking dish (about 28x22cm/11x8½in)and spread evenly. Top with a third of the aubergine slices.

Step 6

Follow with a third of the remaining tomato sauce and top with a third of the mozzarella. Repeat the process for another two layers finishing with tomato sauce and the mozzarella. Place into the preheated oven and bake for 25-30 minutes, or until the dish is bubbling and the mozzarella melted and golden-brown on top.