Wash, dry and quarter the tomatoes. Cut out the seeds. Finely dice the flesh. Peel and finely dice onion and garlic. Wash aubergines, dab dry and cut in half lengthwise.
Scrape out the seeds with a spoon. Heat oil in a pan and fry eggplant halves on the cut surface for 2-3 minutes until golden brown, remove. Season with salt. Sauté onion and garlic in the frying fat until golden brown.
Add the minced meat and fry vigorously for 10 minutes. Season with salt, pepper, paprika and cinnamon. Deglaze with 150 ml water and stir in tomato paste. Fold in diced tomatoes. Wash the oregano, dab dry, pluck the leaves from the stalks and, except for a few for garnishing, fold into the mince.
Finely grate the cheese. Melt the fat, sweat the flour. Deglaze with milk and boil up while stirring. Season with salt and nutmeg. Put the aubergines in a casserole dish and fill with the mince mixture. Pour béchamel sauce over it.
Sprinkle with cheese. Pour stock into the casserole dish. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for 10-15 minutes until golden brown.