Aubergine Slices with Onions and Tomatoes

• 3 medium-sized aubergines
• 2 onions, coarsely chopped
• Olive or a light vegetable oil

Cut the aubergines into 1½-cm (½-inch) slices. Sprinkle generously with salt and let them sweat in a colander for about an hour.

For the filling, fry the onions in 2 tablespoons oil until golden. Add the garlic and stir. When the aroma rises, add the peeled tomatoes with only half their juic