Cut the eggplant into slices. Mix lemon juice and oil in a bowl and season with salt and pepper. Brush the aubergines with the marinade. Grill for 2 - 3 minutes without turning them, until they are golden yellow on the underside.
Turn half of the aubergine slices and top with cheese and chopped tomatoes. Place the other half on the topping as a lid with the light side up. Grill for two minutes, then turn the citizens over and grill for another 2 minutes.