Step by step

Make a layer of potatoes, taking care to cover the whole of the base of the baking tray

Tips
Aubergine is probably native to India. Its name in Italian means roughly "mad apple" because it contains solanine, a harmful substance that tends to diminish with age and disappears completely when cooked.
Trivia
When buying aubergines, pay attention to the following. They must be firm, smooth and shiny: avoid the unripe ones, or those which are wrinkled as they will have been stored for too long. In addition, aubergines can be kept for 2 weeks or so in a paper bag in the vegetable drawer of your fridge.