Wash, clean and slice the aubergines. Spread on a baking tray lined with baking paper. Cook in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 5 minutes
Wash oregano, shake dry, remove leaves except for something to garnish, pluck from the stalks and chop. Peel garlic and press it through a garlic press. Season tomatoes with salt, pepper, garlic and oregano. Stir ricotto, 2 tablespoons parmesan and milk until smooth
Grease a baking dish with oil and fill it successively with 1/3 each of tomato sauce, aubergines and ricotta cream. Repeat until the ingredients are used up. Sprinkle with the remaining Parmesan cheese. Bake in a hot oven at the same temperature for about 30 minutes. Garnish with oregano