Wash the potatoes and cook in boiling water for about 20 minutes. In the meantime wash and clean the tomatoes and zucchini. Cut the zucchini into 1 cm thick slices. Halve tomatoes, remove seeds. Cut the flesh into cubes. Grate parmesan cheese. Wash rosemary, dab dry, pluck needles and chop roughly.
Mix with breadcrumbs, sesame, salt, pepper and parmesan. Quench potatoes cold, peel them and cut them into approx. 1 cm thick slices. Coat a baking tray with 1 tablespoon of oil, spread zucchini, potato slices and diced tomatoes on top. Sprinkle with the sesame and rosemary mixture. Sprinkle with 2-3 tablespoons of oil. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 15 minutes. Arrange on a plate garnished with rosemary