1. Preheat the oven for 200C.
2. Slice the aubergines in length wise and cut the potatoes into 1cm thick slices. Arrange all on 2 baking sheets. Lightly brush with oil, sprinkle with salt and pepper. Baker for 20 minutes.
3. Now comes the lentil mix: heat the oil in a pan and ad the onion & garlic. Cook it for 5 minutes. Add the tomato puree, chopped tomatoes and all the spices. Cook it for 5 more minutes. Finally add the lentils and simmer everything for 5 minutes.
4. Quickly make the bÃ©chamel sauce by adding everything in a sauce pan and on a low heat stir until it thickens.
.5. Now comes the assembling: Grease the baking dish. Arrange half the potato and aubergines on the bottom. Add the lentil mix and top it with the remaining potatoes & aubergines. Finish it off with the bÃ©chamel sauce.